minor changes.

* NEWS: Word changes.
* doc/bison.texi: Spell check.
Fix minor issues.
* tests/headers.at: Comment and formatting changes.

tests/headers.at

@@ -126,8 +126,8 @@ AT_SETUP([Several parsers])
 
 # AT_TEST([PREFIX], [DIRECTIVES])
 # -------------------------------
-# Generate and compile to *.o.  Make sure there is no YY* nor yy* in
-# the header (but YYDEBUG and YYPARSE_PARAM).
+# Generate and compile to *.o.  Make sure there is no (allowed) YY*
+# nor yy* identifiers in the header.
 m4_pushdef([AT_TEST],
 [AT_BISON_OPTION_PUSHDEFS([%define api.prefix "$1_" $2])
 AT_DATA_GRAMMAR([$1.AT_SKEL_CC_IF([yy], [y])],
@@ -161,6 +161,8 @@ exp:
 ]])
 
 AT_BISON_CHECK([-d -o AT_SKEL_CC_IF([$1.cc $1.yy], [$1.c $1.y])])
+
+# Check there is no 'yy' left.
 # C++ output relies on namespaces and still uses yy a lot.
 AT_SKEL_CC_IF([],
   [AT_CHECK([$EGREP yy $1.h], [1])])
@@ -173,8 +175,8 @@ AT_CHECK([[sed -ne 's,/\*[^*]*\*/,,g;s,//.*,,' \
                 -e '/YY/p' ]$1.AT_SKEL_CC_IF([hh], [h])[ |
      $EGREP -wv 'YY(PARSE_PARAM|PUSH_MORE(_DEFINED)?)|(defined|if) YYDEBUG']],
          [1])
-AT_LANG_COMPILE([$1.o])
 
+AT_LANG_COMPILE([$1.o])
 AT_CHECK([[echo "$1" >>expout]])
 
 AT_BISON_OPTION_POPDEFS