Convert \\subsection sections into rst format

sphinx_doc_src/cmds/else.rst

@@ -7,12 +7,14 @@ Synopsis
 if CONDITION; COMMANDS_TRUE...; [else; COMMANDS_FALSE...;] end
 
 
-\subsection else-description Description
+Description
+------------
 
 `if` will execute the command `CONDITION`. If the condition's exit status is 0, the commands `COMMANDS_TRUE` will execute. If it is not 0 and `else` is given, `COMMANDS_FALSE` will be executed.
 
 
-\subsection else-example Example
+Example
+------------
 
 The following code tests whether a file `foo.txt` exists as a regular file.