doc: standardize references to node.js in docs

trivial commit to fix a couple inconsistent references to
the name of the project

PR-URL: https://github.com/nodejs/node/pull/4136
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Klauke <romaaan.git@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

doc/api/documentation.markdown

@@ -65,4 +65,4 @@ Please do not suggest API changes in this area; they will be refused.
 Every HTML file in the markdown has a corresponding JSON file with the
 same data.
 
-This feature was added in node v0.6.12.  It is experimental.
+This feature was added in Node.js v0.6.12.  It is experimental.

doc/api/process.markdown

@@ -24,7 +24,7 @@ finished running the process will exit. Therefore you **must** only perform
 checks on the module's state (like for unit tests). The callback takes one
 argument, the code the process is exiting with.
 
-This event is only emitted when node exits explicitly by process.exit() or
+This event is only emitted when Node.js exits explicitly by process.exit() or
 implicitly by the event loop draining.
 
 Example of listening for `exit`: