docs: Add missing space in “feature set”.

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

docs/documentation/user.md

@@ -11,7 +11,7 @@ The feature articles serve a few different purposes:
 
 - Feature discovery, for someone browsing the `/help` page, and looking at
   the set of titles.
-- Public documentation of our featureset, for someone googling "can zulip do .."
+- Public documentation of our feature set, for someone googling "can zulip do .."
 - Canned responses to support questions; if someone emails a Zulip admin
   asking "how do I change my name", they can reply with a link to the doc.
 - Feature explanations for new Zulip users and admins, especially for

docs/subsystems/settings.md

@@ -17,7 +17,7 @@ Philosophically, the goals of the settings system are to make it
 convenient for:
 
 - Zulip server administrators to configure
-  Zulip's featureset for their server without needing to patch Zulip
+  Zulip's feature set for their server without needing to patch Zulip
 - Realm administrators to configure settings for their organization
   independently without needing to talk with the server administrator.
 - Secrets (passwords, API keys, etc.) to be stored in a separate place

templates/zerver/help/getting-your-organization-started-with-zulip.md

@@ -73,7 +73,7 @@ Zulip integrates directly with dozens of products, and hundreds more through
 The [integrations page](/integrations) has instructions for integrating with
 each product.
 
-## Familiarize yourself with Zulip’s featureset
+## Familiarize yourself with Zulip’s feature set
 
 As the administrator of your Zulip organization, you'll be the initial
 expert teaching other users how to use Zulip.