Resolve "There is nothing about ZSH"

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

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

 # ZSH
 
-The ZSH, short for `z-shell`, is an alternative shell for Linux that offers many convienence features
+The ZSH, short for `z-shell`, is an alternative shell for Linux that offers many convenience features
 for productive use that `bash`, the default shell, does not offer.
 
 This should be a short introduction to `zsh` and offer some examples that are especially useful on Taurus.
@@ -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
@@ -149,8 +149,8 @@ This allows auto-completion for `module load`:
 function _module {
     MODULE_COMMANDS=(
         '-t:Show computer parsable output'
-        'load:Lload a Module'
-        'unload:Unload a Module'
+        'load:Load a module'
+        'unload:Unload a module'
         'spider:Search for a module'
         'avail:Show available modules'
         'list:List loaded modules'
@@ -167,7 +167,7 @@ compdef _module "module"
 
 ### Slurm-specific shortcuts
 
-#### Show slurm log path
+#### Show Slurm log path
 
 This allows you to run `slurmlogpath $SLURM_ID` and get the log-path directly in stdout: