Convert \\subsection sections into rst format

sphinx_doc_src/cmds/emit.rst

@@ -7,12 +7,14 @@ Synopsis
 emit EVENT_NAME [ARGUMENTS...]
 
 
-\subsection emit-description Description
+Description
+------------
 
 `emit` emits, or fires, an event. Events are delivered to, or caught by, special functions called event handlers. The arguments are passed to the event handlers as function arguments.
 
 
-\subsection emit-example Example
+Example
+------------
 
 The following code first defines an event handler for the generic event named 'test_event', and then emits an event of that type.
 
@@ -25,6 +27,7 @@ emit test_event something
 \endfish
 
 
-\subsection emit-notes Notes
+Notes
+------------
 
 Note that events are only sent to the current fish process as there is no way to send events from one fish process to another.