Bug 1916093 - Fix a few more warning issues, and reduce the maximum number of warnings count. r=sylvestre,perftest-reviewers,sparky

Differential Revision: https://phabricator.services.mozilla.com/D220768

browser/components/aboutwelcome/moz.build

@@ -28,3 +28,5 @@ EXTRA_JS_MODULES.aboutwelcome += [
 XPCSHELL_TESTS_MANIFESTS += [
     "tests/xpcshell/xpcshell.toml",
 ]
+
+SPHINX_TREES["docs"] = "docs"

docs/config.yml

@@ -144,4 +144,4 @@ allowed_errors:
     - "security/nss/releases/nss_3_94\\.rst.* ERROR: Unknown target name:"
     - "security/nss/getting_started\\.rst.* CRITICAL: Unexpected section title"
 
-max_num_warnings: 837
+max_num_warnings: 794

docs/contributing/debugging/debugging_firefox_with_rr.rst

@@ -78,7 +78,7 @@ You can also run the entire test harness in rr:
 The trace will contain many processes, so to debug the correct one, you'll want to use rr ps or rr replay -p firefox etc.
 
 Working with multiple processes
-------------------------------
+-------------------------------
 
 rr should work out of the box with multi-process Firefox. Once you have a recording you can use rr ps to show all the process that were recorded and rr replay -p <pid> to attach to a particular process.
 

taskcluster/docs/kinds.rst

@@ -876,5 +876,5 @@ android-l10n
 Update android string resources from android-l10n repo.
 
 release-update-product-channel-version
-------------
+--------------------------------------
 Update the product channel version in Ship-It.

testing/perfdocs/generated/talos.rst

@@ -11167,13 +11167,13 @@ Extra Talos Tests
     :local:
 
 File IO
--------
+=======
 
 File IO is tested using the tp5 test set in the `xperf`_
 test.
 
 Possible regression causes
-~~~~~~~~~~~~~~~~~~~~~~~~~~
+--------------------------
 
 -  **nonmain_startup_fileio opt (with or without e10s) windows7-32** –
    `bug
@@ -11187,7 +11187,7 @@ Possible regression causes
    `e10s <https://treeherder.mozilla.org/perf.html#/graphs?series=%5B%22mozilla-central%22,%222f3af3833d55ff371ecf01c41aeee1939ef3a782%22,1,1%5D&series=%5B%22try%22,%222f3af3833d55ff371ecf01c41aeee1939ef3a782%22,1,1%5D&timerange=604800>`__
 
 Xres (X Resource Monitoring)
-----------------------------
+============================
 
 A memory metric tracked during tp5 test runs. This metric is sampled
 every 20 seconds. This metric is collected on linux only.
@@ -11195,7 +11195,7 @@ every 20 seconds. This metric is collected on linux only.
 `xres man page <https://linux.die.net/man/3/xres>`__.
 
 % CPU
------
+=====
 
 Cpu usage tracked during tp5 test runs. This metric is sampled every 20
 seconds. This metric is collected on windows only.