update markdown/help header format

Since gitiles recommends using # headers over ---/=== underlines,
change the manifest-format.md over and all our help texts.

Change-Id: I96391d41fba769e9f26870d497cf7cf01c8d8ab3
diff --git a/subcmds/sync.py b/subcmds/sync.py
index cda47fd..943a026 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -155,8 +155,7 @@
 The --prune option can be used to remove any refs that no longer
 exist on the remote.
 
-SSH Connections
----------------
+# SSH Connections
 
 If at least one project remote URL uses an SSH connection (ssh://,
 git+ssh://, or user@host:path syntax) repo will automatically
@@ -170,8 +169,7 @@
   export GIT_SSH=ssh
   %prog
 
-Compatibility
-~~~~~~~~~~~~~
+# Compatibility
 
 This feature is automatically disabled on Windows, due to the lack
 of UNIX domain socket support.