mk/wxGTK: Add comments and make a few tiny fixes

[Greg Troxel <gdt%ir.bbn.com@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Greg Troxel <gdt%ir.bbn.com@localhost>
Pushed By:	gdt
Date:		Mon Nov 16 08:55:44 2015 -0500
Changeset:	cbc9c5f83b06a9078d083964f53feaf0b3bcd6ff

Modified Files:
	mk/wxGTK.mk

Log Message:
mk/wxGTK: Add comments and make a few tiny fixes

Explain the big picture that there can be only one version, so this is
about letting a package use it or fail.

Fix a typo and minor word choice.

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=cbc9c5f83b06a9078d083964f53feaf0b3bcd6ff

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 mk/wxGTK.mk | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diffs:
diff --git a/mk/wxGTK.mk b/mk/wxGTK.mk
index 2065991..f728205 100644
--- a/mk/wxGTK.mk
+++ b/mk/wxGTK.mk
@@ -6,11 +6,15 @@
 #	* set WXGTKBASE to the directory of wxGTK package
 #	* set WXGTK_TYPE to the version of wxGTK used.
 #
-# There are two variables that can be used to tweak the selection of
+# Because multiple versions of wxGTK cannot currently coexist, the
+# strategy is to use a single version, with each packge building with
+# it if possible and failing otherwise.
+#
+# There are two variables that can be used to influence the selection of
 # the version of wxGTK.
 #
 # WXGTK_DEFAULT is a user-settable variable whose value is the default
-#	version of wxGTK, for exampe WXGTK28 or WXGTK30.
+#	version of wxGTK, for example WXGTK28 or WXGTK30.
 #
 # WXGTK_ACCEPTED is a package-settable list of wxGTK versions
 #	that may be used by the package.