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-escape.md

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