Convert \\subsection sections into rst format

sphinx_doc_src/cmds/while.rst

@@ -7,7 +7,8 @@ Synopsis
 while CONDITION; COMMANDS...; end
 
 
-\subsection while-description Description
+Description
+------------
 
 `while` repeatedly executes `CONDITION`, and if the exit status is 0, then executes `COMMANDS`.
 
@@ -18,7 +19,8 @@ The exit status of the loop is 0 otherwise.
 
 You can use <a href="#and">`and`</a> or <a href="#or">`or`</a> for complex conditions. Even more complex control can be achieved with `while true` containing a <a href="#break">break</a>.
 
-\subsection while-example Example
+Example
+------------
 
 \fish
 while test -f foo.txt; or test -f bar.txt ; echo file exists; sleep 10; end