Fix contributing.md guide

contributing.md

@@ -14,19 +14,19 @@ See below for a common template that can be followed while creating a new functi
 We love it when new functions:
 
 * are prefixed with `geometry_`
-* are located in [geometry/functions/](geometry/functions)
+* are located in [geometry/functions/](/functions)
 * document their customization options [in the readme][]
 * share screenshots or screencasts in the pull request
 
 ## A sample function template
 
 ``` zsh
-# Define defaults for all environment variables
+# Define defaults for relevant environment variables
 : ${GEOMETRY_<PLUGIN_NAME>_VAR1:="VALUE1"}
 : ${GEOMETRY_<PLUGIN_NAME>_VAR2:="VALUE2"}
 
 # Define the function
-geometry_<plugin_name>() {
+geometry_<function_name>() {
 
   # check if command exists for function to be useful
   (( $+commands[command_i_need_to_work] )) || return
@@ -45,7 +45,8 @@ If you want to set up your own custom function, it's pretty straightforward to d
 so. All you need is to make sure it echos whatever you want printed to the prompt.
 
 Let's assume you want to add a plugin that prints `(☞ﾟ∀ﾟ)☞` when the git branch
-is clean and `(ノಠ益ಠ)ノ彡┻━┻` when it's dirty. Let's call it `pre`my_pretty_git`.
+is clean and `(ノಠ益ಠ)ノ彡┻━┻` when it's dirty.
+Let's call it `my_pretty_git`.
 
 ```zsh
 # my_pretty_git - show emoticons if in a git directory
@@ -96,7 +97,7 @@ will only be display when in a npm or yarn-based project.
 Save the following example as `my_pretty_git.zsh` anywhere.
 Then just source the function and add it to `GEOMETRY_PROMPT` or `GEOMETRY_RPROMPT`.
 
-```sh
+```zsh
 cat <<EOF > my_pretty_git.zsh
 # my_pretty_git - show emoticons if in a git directory
 
@@ -115,7 +116,7 @@ my_pretty_git() {
 }
 EOF
 
-source pretty_git.zsh
+source my_pretty_git.zsh
 GEOMETRY_RPROMPT+=(my_pretty_git)
 ```