internal: fix comment

Change-Id: I666695c95639371cf7462c2973db622afb736953
Reviewed-on: https://go-review.googlesource.com/c/website/+/464256
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

internal/codewalk/codewalk.go

@@ -288,7 +288,7 @@ func (s *server) codewalkFileprint(w http.ResponseWriter, r *http.Request, f str
 	io.WriteString(w, "</pre>")
 }
 
-// addrToByte evaluates the given address starting at offset start in data.
+// addrToByteRange evaluates the given address starting at offset start in data.
 // It returns the lo and hi byte offset of the matched region within data.
 // See https://9p.io/sys/doc/sam/sam.html Table II
 // for details on the syntax.