Fix some stray comment text

[skip changelog]

stb.spec

@@ -9,7 +9,7 @@
 # - It uses of strcat/strcpy into a fixed-length buffer that is assumed (but
 #   not proven) to be large enough for all possible uses
 # - It ignores I/O errors (possibly leading to undefined behavior from reading
-#   uninitialized memory), and so on. Making it
+#   uninitialized memory), and so on.
 #
 # A substantial rewrite would be required to mitigate these concerns. If a
 # request for this library arises, this decision may be revisited, or the