doc: Silence a texinfo warning.

[Collin Funk]

Hi Bruno,

Not sure if this is a bogus texinfo warning since as far as I can tell
it doesn't change the output of the documentation.

make[1]: Entering directory '/home/collin/.local/src/gperf/doc'
cd . && LANG= LC_MESSAGES= LC_ALL= LANGUAGE= makeinfo -c 
CHECK_NORMAL_MENU_STRUCTURE=1 --no-split gperf.texi
gperf.texi:129: warning: unexpected argument on @detailmenu line: --- The 
Detailed Node Listing ---

The attached patch fixes it.  Using:

  $ find . -name '*.texi' | xargs grep -EA1 '^@detailmenu'

Most seem to follow the updated version, so maybe it is meaningful?

COllin

0001-doc-Silence-a-texinfo-warning.patch
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