Fix tfenv install typo

Author: francois-poidevin

terraform-cheat-sheet.adoc

@@ -32,7 +32,7 @@ First of all, download the tfenv binary and put it in your PATH.
 $ git clone https://github.com/Zordrak/tfenv.git
  ~/.tfenv
 $ echo 'export PATH="$HOME/.tfenv/bin:$PATH"'
- >> $HOME/bashrc
+ >> $HOME/.bashrc
 ....
 
 Then, you can install desired version of terraform:
@@ -368,4 +368,4 @@ Example:
 `$ terraforming s3 > aws_s3.tf`
 
 Remarks: As you can see, terraforming can’t extract for the moment API gateway
-resources so you need to write it manually.
+resources so you need to write it manually.