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

doc_src/cmds/string-trim.rst

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+string-trim - remove trailing whitespace
+========================================
+
+Synopsis
+--------
+
+.. BEGIN SYNOPSIS
+
+::
+
+    string trim [(-l | --left)] [(-r | --right)] [(-c | --chars CHARS)] [(-q | --quiet)] [STRING...]
+
+.. END SYNOPSIS
+
+Description
+-----------
+
+.. BEGIN DESCRIPTION
+
+``string trim`` removes leading and trailing whitespace from each STRING. If ``-l`` or ``--left`` is given, only leading whitespace is removed. If ``-r`` or ``--right`` is given, only trailing whitespace is trimmed. The ``-c`` or ``--chars`` switch causes the characters in CHARS to be removed instead of whitespace. Exit status: 0 if at least one character was trimmed, or 1 otherwise.
+
+.. END DESCRIPTION
+
+Examples
+--------
+
+.. BEGIN EXAMPLES
+
+::
+
+    >_ string trim ' abc  '
+    abc
+
+    >_ string trim --right --chars=yz xyzzy zany
+    x
+    zan
+
+
+.. END EXAMPLES