Improve documentation of linkname setting

Mention that it defaults to `browse` if not set. Change the
example to use a value different to the default.

Change-Id: I3f96618f7d6e3f504478044674a6db1d7ca1dba4
diff --git a/src/main/resources/+Documentation/config.md b/src/main/resources/+Documentation/config.md
index 386d6c6..abb6b71 100644
--- a/src/main/resources/+Documentation/config.md
+++ b/src/main/resources/+Documentation/config.md
@@ -30,7 +30,7 @@
 to the gitiles plugin can also be configured.
 
 The name of the link that appears in Gerrit can be configured with
-`gerrit.linkname`.
+`gerrit.linkname`. Defaults to `browse` if not set.
 
 The link frame target name can be configured with `gerrit.target`. Valid values
 are defined in the [W3C HTML Specification](https://www.w3.org/TR/1999/REC-html401-19991224/types.html#type-frame-target).
@@ -38,6 +38,6 @@
 
 ```
   [gerrit]
-    linkname = browse
+    linkname = gitiles
     target = _self
 ```