fix typo

mini typo fix

Author: Klaus Frank

book/A-git-in-other-environments/sections/powershell.asc

@@ -32,7 +32,7 @@ More information about the requirements: (https://docs.microsoft.com/en-us/power
 > Update-Module PowerShellGet -Force
 > Install-Module Posh-Git -Scope AllUsers
 -----
-If you want to install Posh-Git only for the currnet user and not globaly, use "-Scope CurrentUser" instead. 
+If you want to install Posh-Git only for the current user and not globally, use "-Scope CurrentUser" instead. 
 If the 2nd command fails with the message `Update-Module : Module 'PowerShellGet' was not installed by using Install-Module, so it cannot be updated.` You need to run: `Install-Module PowerShellGet -Force -SkipPublisherCheck` instead. This happens, because the modules that ship with Windows Powershell are signed with a different publishment certificate.
 
 ===== Update PowerShell Prompt