dpkg-shlibdeps(1): Add missing “with”

man/dpkg-shlibdeps.1

@@ -18,7 +18,7 @@ as variable names
 .BI shlibs: dependencyfield
 where
 .I dependencyfield
-is a dependency field name. Any other variables starting
+is a dependency field name. Any other variables starting with
 .I shlibs:
 are removed from the file.
 .P