squash! docs(man): write about the combination of a kind letter and a kind name

Wrong English usage is pointed out by @ploxiln.

Author: masatake

man/ctags-incompatibilities.7.rst.in

@@ -134,8 +134,8 @@ A combination of a kind letter and a kind name
 In Universal-ctags, the combination of
 a kind letter and a kind name must be unique in a language.
 
-You cannot define more than one kinds reusing a kind letter with
-different kind names. You cannot define more than one kinds reusing a
+You cannot define more than one kind reusing a kind letter with
+different kind names. You cannot define more than one kind reusing a
 kind name with different kind letters.
 
 An example::