Polish

See gh-1509

CONTRIBUTING-DOCUMENTATION.adoc

@@ -1,7 +1,7 @@
 = How to contribute to the reference manual
 
-The Spring Framework reference manual uses http://asciidoctor.org/[asciidoctor]. This
-document describes how to contribute documentation updates.
+The Spring Framework reference manual uses http://asciidoctor.org/[asciidoctor].
+This document describes how to contribute documentation updates.
 
 == Building with Gradle
 
@@ -12,17 +12,20 @@ the project root execute the following command:
 
 The generated reference manual will then be available at `build/asciidoc/html5/index.html`.
 
-== Live editing
+== Live Editing
 
 One of the nice features about using asciidoctor is the support for live editing.
 
 You will find a Guardfile already present at `spring-framework/src/asciidoc/Guardfile`.
 Make sure first to follow the setup instructions within the
-http://asciidoctor.org/docs/editing-asciidoc-with-live-preview/[Editing AsciiDoc with Live Preview]
-document. Once you have done that, there are additional gems to install to make it work
-(assuming that you are using http://livereload.com/[LiveReload]):
+http://asciidoctor.org/docs/editing-asciidoc-with-live-preview/[Editing AsciiDoc
+with Live Preview] document. Once you have done that, there are additional gems to
+install to make it work (assuming that you are using http://livereload.com/[LiveReload]):
 
-	gem install guard-rspec guard-livereload
+[source]
+----
+gem install guard-rspec guard-livereload
+----
 
 When running `guard start` within the `src/asciidoc/` folder, any changes to the
 `src/asciidoc/index.adoc` file will automatically be written to
@@ -30,17 +33,17 @@ When running `guard start` within the `src/asciidoc/` folder, any changes to the
 
 == Troubleshooting
 
-* If you are using LiveReload, make sure to select _Allow access to file URLs_ in the
-  LiveEdit plugin options of your browser.
-* The icon used to enable _LiveReload_ can be a bit confusing. The dot is empty when it is
-  disabled and full when the plugin is active. Make sure to enable it on the tab
-  displaying the `index.html` file.
-* Ensure you are _not_ running guard start at all as two instances could not run at the
-  same time. To exit a current session in a clean way, just type e in the shell.
+* If you are using LiveReload, make sure to select _Allow access to file
+URLs_ in the LiveEdit plugin options of your browser.
+* The icon used to enable _LiveReload_ can be a bit confusing. The dot is empty
+when it is disabled and full when the plugin is active. Make sure to enable it
+on the tab displaying the `index.html` file.
+* Ensure you are _not_ running `guard start` at all as two instances could not run
+at the same time. To exit a current session in a clean way, type `e` in the shell.
 
-== Documentation notes
+== Documentation Notes
 
-Some notes on documentation
+Some notes on the documentation.
 
 * Documentation is wrapped at 90 chars; ensure that you manually wrap your edits.
 * Tabs are used for indentation; do not use spaces.
@@ -48,4 +51,3 @@ Some notes on documentation
 * http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/[Asciidoctor Quick Reference]
 * http://asciidoctor.org/docs/user-manual/[Asciidoctor Manual]
 * http://asciidoctor.org/docs/asciidoc-writers-guide/[Asciidoctor Writers Guide]
-