Fix typo in Elastic Agent limit for Serverless (#2341)

This PR fixes a typo in the maximum number of Elastic Agents that can be
connected to a Serverless project. It also rephrases a bit for clarity
(hopefully).

Also fixes a small formatting issue in the doc.

Closes #1496

---------

Co-authored-by: Colleen McGinnis <[email protected]>
Co-authored-by: Benjamin Ironside Goldstein <[email protected]>

Author: 3 people

reference/fleet/fleet-agent-serverless-restrictions.md

@@ -15,7 +15,7 @@ products:
 
 If you are using {{agent}} with [{{serverless-full}}](/deploy-manage/deploy/elastic-cloud/serverless.md), note these differences from use with {{ech}} and self-managed {{es}}:
 
-* The number of {{agents}} that may be connected to an {{serverless-full}} project is limited to 10 thousand.
+* A maximum of 10,000 {{agents}} may be connected to an {{serverless-full}} project.
 * The minimum supported version of {{agent}} supported for use with {{serverless-full}} is 8.11.0.
 
 ### Outputs
@@ -33,9 +33,9 @@ For more information, see [](upgrade-elastic-agent.md) and [](upgrade-standalone
 
 The path to get to the {{fleet}} application in {{kib}} differs across projects:
 
-* In {{ech}} deployments, navigate to **Management > Fleet**.
-* In {{serverless-short}} {{observability}} projects, navigate to **Project settings > Fleet**.
-* In {{serverless-short}} Security projects, navigate to **Assets > Fleet**.
+* In {{ech}} deployments, navigate to **Management** → **Fleet**.
+* In {{serverless-short}} {{observability}} projects, navigate to **Project settings** → **Fleet**.
+* In {{serverless-short}} Security projects, navigate to **Assets** → **Fleet**.
 
 
 ## {{fleet-server}} [fleet-server-serverless-restrictions]