Resolve "There is nothing about ZSH"

Closes #216 (closed), #217 (closed)

doc.zih.tu-dresden.de/docs/software/zsh.md

@@ -96,7 +96,7 @@ mcd () {
 You can then
 
 ```
-marie@login$ mcd non-existant-directory
+marie@login$ mcd non-existent-directory
 ```
 
 and it will create it and `cd` into it
@@ -149,7 +149,7 @@ This allows auto-completion for `module load`:
 function _module {
     MODULE_COMMANDS=(
         '-t:Show computer parsable output'
-        'load:Lload a Module'
+        'load:Load a module'
         'unload:Unload a module'
         'spider:Search for a module'
         'avail:Show available modules'