doc: Correct various Texinfo warnings about incorrect use of macros. * install.txi: Change @strong{Note:} to @strong{Note}: to move colon outside of macro. * edit.m: Change "WARNING!" to "Warning:" for consistency with other instances. * wilcoxon_test.m: Change "Warning:" to "Caution:" to more accurately reflect level of concern. * strmatch.m: Change @strong{Note:} to @strong{Caution:} to stop spurious cross-reference creation. * datenum.m: Change "Warning:" to "Caution:" to more accurately reflect level of concern. * oct-parse.yy: Change @xref to an @pxref to suppress warning about incorrect usage.

--- a/scripts/time/datenum.m
+++ b/scripts/time/datenum.m
@@ -50,7 +50,7 @@
 ## Days can be fractional.
 ## @end itemize
 ##
-## @strong{Warning:} this function does not attempt to handle Julian
+## @strong{Caution:} this function does not attempt to handle Julian
 ## calendars so dates before Octave 15, 1582 are wrong by as much
 ## as eleven days.  Also be aware that only Roman Catholic countries
 ## adopted the calendar in 1582.  It took until 1924 for it to be