Minor fixes to chapter 21 of the Getting Started guide

Mostly very minor rephrasings here and there.

Author: whatyouhide

getting_started/21.markdown

@@ -9,7 +9,7 @@ last: true
 
 {% include toc.html %}
 
-Eager to learn more? Keep on reading!
+Eager to learn more? Keep reading!
 
 ## 21.1 Build your first Elixir project
 
@@ -23,11 +23,11 @@ We have written a guide that covers how to build an Elixir application, with its
 
 ## 21.2 Community and other resources
 
-On the sidebar, you can find the link to some Elixir books and screencasts. There are plenty of Elixir resources out there, like conference talks, open source projects, and other learning materials produced by the community.
+On the sidebar, you can find links to Elixir books and screencasts. There are plenty of Elixir resources out there, like conference talks, open source projects, and other learning material produced by the community.
 
-Remember that in case of any difficulties, you can always visit the **#elixir-lang** channel on **irc.freenode.net** or send a message to the [mailing list](http://groups.google.com/group/elixir-lang-talk). You can be sure that there will be someone willing to help. And to keep posted on the latest news and announcements, follow the [blog](/blog/) and follow language developments on the [elixir-core mailing list](http://groups.google.com/group/elixir-lang-core).
+Remember that in case of any difficulties, you can always visit the **#elixir-lang** channel on **irc.freenode.net** or send a message to the [mailing list](http://groups.google.com/group/elixir-lang-talk). You can be sure that there will be someone willing to help. To keep posted on the latest news and announcements, follow the [blog](/blog/) and follow the language development on the [elixir-core mailing list](http://groups.google.com/group/elixir-lang-core).
 
-Don't forget [you can also check the source code of Elixir itself](https://github.com/elixir-lang/elixir), which is mostly written in Elixir (mainly the `lib` directory), or [explore Elixir's documentation](/docs.html).
+Don't forget that you can also check the [source code of Elixir itself](https://github.com/elixir-lang/elixir), which is mostly written in Elixir (mainly the `lib` directory), or [explore Elixir's documentation](/docs.html).
 
 ## 21.3 A Byte of Erlang