Fix typo and add to docs

Author: MenelvagorMilsom

README.md

@@ -73,6 +73,10 @@ Launch many projects at the same time:
 ```powershell
 Get-UnityProjectInstance -Recurse | Start-UnityEditor
 ```
+Invoke methods with arbitrary arguments:
+```powershell
+Start-UnityEditor -ExecuteMethod Build.Invoke -BatchMode -Quit -LogFile .\build.log -Wait -AdditionalArguments "-BuildArg1 -BuildArg2"
+```
 Find the installers for a particular version:
 ```powershell
 Find-UnitySetupInstaller -Version '2017.3.0f3' | Format-Table

UnitySetup/UnitySetup.psd1

@@ -14,7 +14,7 @@
     RootModule        = 'UnitySetup'
 
     # Version number of this module.
-    ModuleVersion     = '5.0'
+    ModuleVersion     = '5.1'
 
     # Supported PSEditions
     # CompatiblePSEditions = @()

UnitySetup/UnitySetup.psm1

@@ -755,7 +755,7 @@ function Get-UnityProjectInstance {
 .PARAMETER ExecuteMethod
    The script method for the Unity Editor to execute.
 .PARAMETER AdditionalArguments
-   Additiong arguments for Unity or your custom method
+   Additional arguments for Unity or your custom method
 .PARAMETER OutputPath
    The output path that the Unity Editor should use.
 .PARAMETER LogFile
@@ -797,7 +797,7 @@ function Get-UnityProjectInstance {
 .EXAMPLE
    Start-UnityEditor -Version 2017.3.0f3
 .EXAMPLE
-   Start-UnityEditor -ExecuteMethod Build.Invoke -BatchMode -Quit -LogFile .\build.log -Wait
+   Start-UnityEditor -ExecuteMethod Build.Invoke -BatchMode -Quit -LogFile .\build.log -Wait -AdditionalArguments "-BuildArg1 -BuildArg2"
 .EXAMPLE
    Get-UnityProjectInstance -Recurse | Start-UnityEditor -BatchMode -Quit
 .EXAMPLE