Sneak in an extra grammar fix or two.

You know, while @ajlanghorn's in there already.

puppet.md

@@ -7,13 +7,13 @@
 
 ## Things that should not be in the Puppet Repo
 
--   **Secrets.** It is bad practise to embed your secret data (passwords, 
+-   **Secrets.** It is bad practice to embed your secret data (passwords, 
     tokens) within Puppet. To do so means that even if you specify that a 
     secret applies to one particular environment it is available on the 
     PuppetMaster for every environment. It is good practise to store 
     secrets in the `deployment` repo at `Puppet/hieradata/${environment}.yaml`.     Please make sure where necessary you have different secrets for each value.
 
--   **Per Environment switches**. The Puppet repo should not know the 
+-   **Per-environment switches**. The Puppet repo should not know the 
     specifics of each environment. By switching on platform or environment
     variables, you make it difficult to add new platforms and hard to ensure
     that consistent behaviour is applied across all environments. To apply a