Small improvements to release docs

RELEASING.md

@@ -8,15 +8,16 @@ the steps:
 
 2. Bump the version number in `lib/nesta/version.rb`. This will cause
    the version number in `Gemfile.lock` to be updated too, so regenerate
-   it now and check them in together.
+   it now (e.g. run `bundle install`) and check them in together.
 
 3. Update the `CHANGLOG.md` file with a summary of significant changes since
    the previous release.
 
 4. Commit these changes with a commit message of 'Bump version to <version>'
 
-5. Generate a new site with the `nesta` command, install the demo content,
-   check that it runs okay locally.
+5. Install the gem locally (`rake install`), then generate a new site
+   with the `nesta` command. Install the demo content site, check that
+   it runs okay locally.
 
 6. If everything seems fine, run `rake release`.