Bug 1866741 - doc: remove the duplicate Note: info in the note section DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D194785

docs/contributing/how_to_submit_a_patch.rst

@@ -210,7 +210,7 @@ reviewed.
 
 .. note::
 
-   Note: Be sure to build the application with the patch applied. This
+   Be sure to build the application with the patch applied. This
    ensures it runs as expected, passing automated tests, and/or runs
    through the `try
    server <https://wiki.mozilla.org/Build:TryServerAsBranch>`__. In the

netwerk/docs/http_server_for_testing.rst

@@ -97,7 +97,7 @@ However, this should only be used as the last possible option.
 
 .. note::
 
-   Note: You **must** make sure to stop the server (the last line above)
+   You **must** make sure to stop the server (the last line above)
    before your test completes. Failure to do so will result in the
    "XPConnect is being called on a scope without a Components property"
    assertion, which will cause your test to fail in debug builds, and