Reviewing the use of <informalexample> and <screen>.

In some cases <informalexample> wasn't appropriate, and the markup was
changed to <programlisting> or other.

In some cases there were spurious <para> elements before and after the
<informalexample>. These were removed.

Reformatted text within <screen> elements because the whitespace *is*
significant.

Added <prompt> and <userinput> elements within <screen> where necessary.

If I spotted inappropriate use of markup within the immediate vicinity
of the <informalexample> elements then I fixed that (mostly the use of
<emphasis remap="...">).

This is part one of these changes -- there's a load of them, and this
goes up to line 11,284 or thereabouts, roughly one third of the way
through.

en/handbook/README

@@ -335,3 +335,24 @@ for example,
      Also markup other prompts (e.g., the DOS prompt C:\> that occurs in
      some places) as <prompt>s.
 
+ 31. Reviewing the use of <informalexample> and <screen>.
+
+     In some cases <informalexample> wasn't appropriate, and the markup was
+     changed to <programlisting> or other.
+
+     In some cases there were spurious <para> elements before and after the
+     <informalexample>. These were removed.
+
+     Reformatted text within <screen> elements because the whitespace *is*
+     significant.
+
+     Added <prompt> and <userinput> elements within <screen> where necessary.
+
+     If I spotted inappropriate use of markup within the immediate vicinity
+     of the <informalexample> elements then I fixed that (mostly the use of
+     <emphasis remap="...">).
+
+     This is part one of these changes -- there's a load of them, and this
+     goes up to line 11,284 or thereabouts, roughly one third of the way
+     through.
+