api docs: Change Shakespeare quote.

The previous quote doesn't come off well if you don't know the reference
(which the majority of our users will not).

templates/zerver/api/send-message.md

@@ -29,7 +29,7 @@ zulip(config).then((client) => {
         to: 'Denmark',
         type: 'stream',
         subject: 'Castle',
-        content: 'Something is rotten in the state of Denmark.'
+        content: 'I come not, friends, to steal away your hearts.'
     }
 
     client.messages.send(params).then(console.log);
@@ -41,7 +41,7 @@ zulip(config).then((client) => {
     const params = {
         to: 'hamlet@example.com',
         type: 'private',
-        content: 'I come not, friends, to steal away your hearts.',
+        content: 'With mirth and laughter let old wrinkles come.',
     }
 
     client.messages.send(params).then(console.log);
@@ -58,14 +58,14 @@ curl {{ api_url }}/v1/messages \
     -d "type=stream" \
     -d "to=Denmark" \
     -d "subject=Castle" \
-    -d $"content=Something is rotten in the state of Denmark."
+    -d $"content=I come not, friends, to steal away your hearts."
 
 # For private messages
 curl {{ api_url }}/v1/messages \
     -u BOT_EMAIL_ADDRESS:BOT_API_KEY \
     -d "type=private" \
     -d "to=hamlet@example.com" \
-    -d $"content=I come not, friends, to steal away your hearts."
+    -d $"content=With mirth and laughter let old wrinkles come."
 ```
 
 {tab|zulip-send}
@@ -92,7 +92,7 @@ If you'd like, you can also provide the message on the command-line with the
 
 ```bash
 zulip-send --stream Denmark --subject Castle \
-    --message "Something is rotten in the state of Denmark." \
+    --message "I come not, friends, to steal away your hearts." \
     --user othello-bot@example.com --api-key a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5
 ```
 

zerver/lib/api_test_helpers.py

@@ -451,7 +451,7 @@ def send_message(client):
         "type": "stream",
         "to": "Denmark",
         "subject": "Castle",
-        "content": "Something is rotten in the state of Denmark."
+        "content": "I come not, friends, to steal away your hearts."
     }
     result = client.send_message(request)
     # {code_example|end}
@@ -473,7 +473,7 @@ def send_message(client):
     request = {
         "type": "private",
         "to": "iago@zulip.com",
-        "content": "I come not, friends, to steal away your hearts."
+        "content": "With mirth and laughter let old wrinkles come."
     }
     result = client.send_message(request)
     # {code_example|end}
@@ -498,7 +498,7 @@ def test_nonexistent_stream_error(client):
         "type": "stream",
         "to": "nonexistent_stream",
         "subject": "Castle",
-        "content": "Something is rotten in the state of Denmark."
+        "content": "I come not, friends, to steal away your hearts."
     }
     result = client.send_message(request)
 
@@ -510,7 +510,7 @@ def test_private_message_invalid_recipient(client):
     request = {
         "type": "private",
         "to": "eeshan@zulip.com",
-        "content": "I come not, friends, to steal away your hearts."
+        "content": "With mirth and laughter let old wrinkles come."
     }
     result = client.send_message(request)
 
@@ -551,7 +551,7 @@ def test_update_message_edit_permission_error(client, nonadmin_client):
         "type": "stream",
         "to": "Denmark",
         "subject": "Castle",
-        "content": "Something is rotten in the state of Denmark."
+        "content": "I come not, friends, to steal away your hearts."
     }
     result = client.send_message(request)
 
@@ -581,7 +581,7 @@ def test_delete_message_edit_permission_error(client, nonadmin_client):
         "type": "stream",
         "to": "Denmark",
         "subject": "Castle",
-        "content": "Something is rotten in the state of Denmark."
+        "content": "I come not, friends, to steal away your hearts."
     }
     result = client.send_message(request)
 
@@ -618,7 +618,7 @@ def update_message_flags(client):
         "type": "stream",
         "to": "Denmark",
         "subject": "Castle",
-        "content": "Something is rotten in the state of Denmark."
+        "content": "I come not, friends, to steal away your hearts."
     }  # type: Dict[str, Any]
     message_ids = []
     for i in range(0, 3):

zerver/openapi/zulip.yaml

@@ -104,7 +104,7 @@ paths:
                                 "message": {
                                     "avatar_url": "https://url/for/othello-bots/avatar",
                                     "client": "website",
-                                    "content": "Something is rotten in the state of Denmark.",
+                                    "content": "I come not, friends, to steal away your hearts.",
                                     "content_type": "text/x-markdown",
                                     "display_recipient": "Denmark",
                                     "id": 12345678,
@@ -126,7 +126,7 @@ paths:
                                 "message": {
                                     "avatar_url": "https://url/for/othello-bots/avatar",
                                     "client": "website",
-                                    "content": "I come not, friends, to steal away your hearts.",
+                                    "content": "With mirth and laughter let old wrinkles come.",
                                     "content_type": "text/x-markdown",
                                     "display_recipient": [
                                         {