Extended a comment in stdext/stringext.ml
Extended a comment in stdext/stringext.ml

Signed-off-by: Matthias Goergens <e2af6b73ff197cc616c536c769ba8d59da228169@citrix.com>

johnelse/forkexecd,xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch,djs55/forkexecd