Copy doc_src to sphinx_doc_src and add a TOC

sphinx_doc_src/cmds/break.rst

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+\section break break - stop the current inner loop
+
+\subsection break-synopsis Synopsis
+\fish{synopsis}
+LOOP_CONSTRUCT; [COMMANDS...] break; [COMMANDS...] end
+\endfish
+
+\subsection break-description Description
+
+`break` halts a currently running loop, such as a <a href="#for">for</a> loop or a <a href="#while">while</a> loop. 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.
+
+There are no parameters for `break`.
+
+
+\subsection break-example Example
+The following code searches all .c files for "smurf", and halts at the first occurrence.
+
+\fish
+for i in *.c
+    if grep smurf $i
+        echo Smurfs are present in $i
+        break
+    end
+end
+\endfish