[patch] Fix make.texi typo

[John Marshall]

A tiny patch for the documentation, adding a missing comma.

Cheers,

    John

diff --git a/doc/make.texi b/doc/make.texi
index 86a1aeb..f506102 100644
--- a/doc/make.texi
+++ b/doc/make.texi
@@ -5616,7 +5616,7 @@ Several variables have constant initial values.
 @cindex !=
 
 To set a variable from the makefile, write a line starting with the
-variable name followed by @samp{=} @samp{:=}, or @samp{::=}.  Whatever
+variable name followed by @samp{=}, @samp{:=}, or @samp{::=}.  Whatever
 follows the @samp{=}, @samp{:=}, or @samp{::=} on the line becomes the
 value.  For example,


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