Add subdirectories

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doc_src/return.txt

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+\section return return - Stop the innermost currently evaluated function
+
+\subsection return-synopsis Synopsis
+ <tt>function NAME; [COMMANDS...] break [STATUS]; [COMMANDS...] end</tt>
+
+\subsection return-description Description The \c return builtin is
+used to halt a currently running function. It is usually added inside
+of a conditional block such as an <a href="#if">if</a> statement or a
+<a href="#switch">switch</a> statement to conditionally stop the
+executing function and return to the caller.
+
+- \c STATUS is the return status of the function. If unspecified, the status is set to 0.
+
+\subsection return-example Example
+The following code is an implementation of the false program as a fish builtin
+<p>
+<pre>function false
+	return 1
+end</pre>
+</p>
+