DOC: configuration: add clarification on escaping in keyword arguments

Add a more precise description on how backslash escaping is different
than the top-level parser, and give examples of how to handle single
quotes inside arguments.

(cherry picked from commit cd34ad7133429e9cb0996aa93bac34ca6b33a869)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed