Group pull request info back together, since only engine contributors can realistically review pull requests.

engine/first_steps.rst

@@ -1,4 +1,4 @@
-First Steps
+First steps
 ===========
 
 The possibility to study, use, modify and redistribute modifications of the

engine/pull_requests/index.rst

@@ -0,0 +1,13 @@
+Pull requests
+=============
+
+This section explains how to work with pull requests.
+
+.. toctree::
+   :maxdepth: 1
+   :name: sec-pull-requests
+
+   creating_pull_requests
+   review_process
+   review_guidelines
+   testing

index.rst

@@ -128,7 +128,7 @@ Community support
    :name: sec-engine
 
    engine/first_steps
-   engine/creating_pull_requests
+   engine/pull_requests/index
    engine/cpp_usage_guidelines
    engine/code_style
    engine/compatibility_breakages
@@ -178,16 +178,6 @@ Community support
    triage/release_blockers
    triage/team_trackers
 
-.. toctree::
-   :hidden:
-   :maxdepth: 1
-   :caption: Pull Request Review
-   :name: sec-pull-request-review
-
-   pull_request_review/process
-   pull_request_review/guidelines
-   pull_request_review/testing
-
 .. toctree::
    :hidden:
    :maxdepth: 1