We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/emit.rst

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+.. _cmd-emit:
+
+emit - Emit a generic event
+===========================
+
+Synopsis
+--------
+
+::
+
+    emit EVENT_NAME [ARGUMENTS...]
+
+Description
+-----------
+
+``emit`` emits, or fires, an event. Events are delivered to, or caught by, special functions called :ref:`event handlers <event>`. The arguments are passed to the event handlers as function arguments.
+
+
+Example
+-------
+
+The following code first defines an event handler for the generic event named 'test_event', and then emits an event of that type.
+
+
+
+::
+
+    function event_test --on-event test_event
+        echo event test: $argv
+    end
+    
+    emit test_event something
+
+
+
+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.