docs/config: uppercase @PLUGIN@ macro to fix substitution

Change-Id: If58e79540c267edb05adea7f8e533b0c29591c86

src/main/resources/Documentation/config.md

diff --git a/src/main/resources/Documentation/config.md b/src/main/resources/Documentation/config.md
index 62a30df..dde673b 100644
--- a/src/main/resources/Documentation/config.md
+++ b/src/main/resources/Documentation/config.md
@@ -145,7 +145,7 @@
 `review_site/etc/its/actions.config`. Rules specific to @PLUGIN@ are defined in
 the file `review_site/etc/its/actions-@PLUGIN@.config`.
 
-**Sample actions-@Plugin@.config:**
+**Sample actions-@PLUGIN@.config:**
 
     [rule "open"]
         event-type = patchset-created
@@ -172,7 +172,7 @@
 used by the JIRA server as different versions of JIRA can have different workflow actions.
 
 **Note:** Velocity comments were deprecated in Gerrit 2.14 and will be removed in Gerrit 2.16/3.0;
-the `actions-@Plugin@.config` needs to be changed accordingly. For example, to use Soy comments
+the `actions-@PLUGIN@.config` needs to be changed accordingly. For example, to use Soy comments
 instead of velocity comments:
 
     [rule "open"]