xml: changes requested by marchersimon,

which undo the "the" changes previously made for sbrl.
The `select`, `edit`, and `transform` subcommands are not yet ready.

pages/common/xml-unescape.md

@@ -1,13 +1,13 @@
 # xml unescape
 
-> Unescape special XML characters.
+> Unescape special XML characters, e.g. `&lt;a1&gt;` -> `<a1>`.
 > More information: <http://xmlstar.sourceforge.net/docs.php>.
 
 - Unescape special XML characters from a string:
 
 `xml unescape "{{&lt;a1&gt;}}"`
 
-- Unescape special XML characters from the standard input:
+- Unescape special XML characters from stdin:
 
 `echo  "{{&lt;a1&gt;}}" | xml unescape`