content/matchlang: disable .play

text repo is not in yet.

Change-Id: I76dcd2e86e9c2d1f98f08f233533b996a0cedf91
Reviewed-on: https://go-review.googlesource.com/19418
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/content/matchlang.article b/content/matchlang.article
index 8548590..ab8a7d0 100644
--- a/content/matchlang.article
+++ b/content/matchlang.article
@@ -10,7 +10,8 @@
 in its user interface.
 When a user arrives with a list of preferred languages, the application must
 decide which language it should use in its presentation to the user.
-This requires finding the best match between the languages the applications supports and those the user prefers.
+This requires finding the best match between the languages the applications supports 
+and those the user prefers.
 This post explains why this is a difficult decision and how how Go can help.
 
 * Language Tags
@@ -135,7 +136,7 @@
 Here is a sample program, explained below, matching a user's language
 preferences against an application's supported languages:
 
-.play -edit matchlang/complete.go
+.code -edit matchlang/complete.go
 
 ** Creating Language Tags
 
@@ -271,7 +272,7 @@
 
 For example:
 
-.play -edit matchlang/display.go /START/,/END/
+.code -edit matchlang/display.go /START/,/END/
 
 prints