doc: remove an errant dot.

Curses!

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5489048

doc/devel/weekly.html

@@ -22,7 +22,7 @@ This release includes language changes and changes to goinstall and gofmt.
 Equality and inequality (== and !=) are now defined for struct and array
 values, respectively, provided the elements of the data structures can
 themselves be compared. See the Go 1 release notes for the details:
-	http://weekly..golang.org/doc/go1.html#equality
+	http://weekly.golang.org/doc/go1.html#equality
 
 The rune type is now an alias for int32 and character literals have the default
 type of rune. Code that uses int where it should use rune will break.