Add missing configuration files man pages

[jbfavre]

Add missing sni.yaml and strategies.yaml man pages.

Previous list for appendices/command-line was sorted per man sections.
But, IMHO, having it sorted by file name makes list update easier.
I also tried to improve file readability in avoiding too long lines.

[bneradt]

Looks like the autopep8 command fails:
https://ci.trafficserver.apache.org/job/Github_Builds/job/clang-format/1094/console

Running autopep8. This may take a minute.
autopep8 completed.
+ '[' 0 '!=' 0 ']'
+ git diff --exit-code
diff --git a/doc/manpages.py b/doc/manpages.py
index 905cc0358..84ebba95e 100644
--- a/doc/manpages.py
+++ b/doc/manpages.py
@@ -22,8 +22,8 @@ man_pages = [
     ('developer-guide/api/functions/' + filename[:-4],
         filename.split('.', 1)[0],
         filename.split('.', 1)[0] + ' API function', None, '3ts')
-        for filename in os.listdir('developer-guide/api/functions/')
-        if filename != 'index.en.rst' and filename.endswith('.rst')] + [
+    for filename in os.listdir('developer-guide/api/functions/')
+    if filename != 'index.en.rst' and filename.endswith('.rst')] + [
 
     # Add all files in the appendices/command-line directory to the list
     # of manual pages
+ '[' 0 '!=' 1 ']'
+ exit 1

We should be able to fix this by running the make autopep8 target in the build tree.

[zwoop]

Cherry-picked to v9.2.x