apparently a "[[:space:]]" doesn't work properly inside a "[^ ... ]";

replace it with a literal space and a literal tab, so that include files
are properly colored again


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2766 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

doc/nanorc.sample

@@ -169,7 +169,7 @@
 ## because syntax highlighting rules will be applied in the order they
 ## are read in.
 ##
-# color brightyellow "<[^=[[:space:]]]*>" ""(\\.|[^\"])*""
+# color brightyellow "<[^= 	]*>" ""(\\.|[^\"])*""
 ##
 ## This string is VERY resource intensive!!!
 # color brightyellow start=""(\\.|[^\"])*\\[[:space:]]*$" end="^(\\.|[^\"])*""