Porter's Handbook: Tweak conflict instructions

Reviewed by:	crees
Approved by:	doc (ygy)
Differential Revision:	https://reviews.freebsd.org/D28582

documentation/content/en/books/porters-handbook/makefiles/chapter.adoc

@@ -4608,7 +4608,7 @@ CONFLICTS_INSTALL=	bind99
 
 ====
 
-Sometime, only some version of another port is incompatible, in this case, use the full package name, with the version, and use shell globs, like `*` and `?` to make sure all possible versions are matched.
+Sometimes, only certain versions of another port are incompatible.  When this is the case, use the full package name including the version.  If necessary, use shell globs like `*` and `?` so that all necessary versions are matched.
 
 [[conflicts-ex2]]
 .Using `CONFLICTS*` With Globs.