Documentation: Refactor to match other plugin documentation

Replace hard-coded command for plugin in-tree build.

Change-Id: Icd2027015c55d5adfe4bbb2950284d4f8743215e
diff --git a/src/main/resources/+Documentation/build.md b/src/main/resources/+Documentation/build.md
index edf166b..8facc55 100644
--- a/src/main/resources/+Documentation/build.md
+++ b/src/main/resources/+Documentation/build.md
@@ -52,14 +52,14 @@
 ```
   cd gerrit/plugins
   rm external_plugin_deps.bzl
-  ln -s gitiles/external_plugin_deps.bzl .
+  ln -s @PLUGIN@/external_plugin_deps.bzl .
 ```
 
 Then issue
 
 ```
   cd ..
-  bazel build plugins/gitiles
+  bazel build plugins/@PLUGIN@
 ```
 
 in the root of Gerrit's source tree to build
@@ -67,7 +67,7 @@
 The output is created in
 
 ```
-  bazel-bin/plugins/gitiles/gitiles.jar
+  bazel-bin/plugins/@PLUGIN@/@PLUGIN@.jar
 ```
 
 This project can be imported into the Eclipse IDE. Add the plugin name to the