docs: Optimize /api links to skip trailing slash redirect.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

templates/corporate/for/business.html

@@ -282,7 +282,7 @@
                     <li>
                         <div class="list-content">
                             Build your own integrations with Zulip’s
-                            easy-to-use <a href="/api">RESTful
+                            easy-to-use <a href="/api/">RESTful
                             API</a>, <a href="/api/installation-instructions">client
                             bindings</a>, <a href="/api/incoming-webhooks-overview">incoming
                             webhooks</a>, <a href="/api/outgoing-webhooks">outgoing

templates/corporate/for/open-source.html

@@ -511,7 +511,7 @@
                     <li>
                         <div class="list-content">
                             Build your own integrations with Zulip’s
-                            easy-to-use <a href="/api">RESTful
+                            easy-to-use <a href="/api/">RESTful
                             API</a>, <a href="/api/installation-instructions">client
                             bindings</a>, <a href="/api/incoming-webhooks-overview">incoming
                             webhooks</a>, <a href="/api/outgoing-webhooks">outgoing

templates/corporate/self-hosting.html

@@ -238,7 +238,7 @@
                     </h1>
                     <p>
                         <a href="/api/incoming-webhooks-overview">Creating custom integrations</a> is a breeze with
-                        our well-documented <a href="/api">REST API</a>.
+                        our well-documented <a href="/api/">REST API</a>.
                     </p>
                     <p>
                         Zulip makes it easy to

templates/zerver/integrations/capistrano.md

@@ -22,7 +22,7 @@ Get Zulip notifications for your Capistrano deploys!
 
     The `--user` and `--api-key` should be the email and API key of the Zulip
     bot created above. You can also put these values in a `~/.zuliprc` file on
-    your Capistrano machine. See our [API docs](/api) for instructions on
+    your Capistrano machine. See our [API docs](/api/) for instructions on
     creating that file.
 
 !!! tip ""

templates/zerver/integrations/jenkins.md

@@ -53,7 +53,7 @@ To learn more, see the [plugin's README](https://github.com/jenkinsci/zulip-plug
    If not, create the stream and make sure you're subscribed to it.
 
 1. Are your API key and email address correct? Test them
-   using [our curl API](/api).
+   using [our curl API](/api/).
 
 1. Configure a Jenkins log recorder for **jenkins.plugins.zulip**
    and check why your messages fail to send.