update doco for pwsh

Author: plicease

README.md

@@ -245,7 +245,7 @@ All other instance methods will return false
 
     my $shell = Shell::Guess->power_shell;
 
-Returns an instance of Shell::Guess for Windows PowerShell.
+Returns an instance of Shell::Guess for Microsoft PowerShell (either for Windows `powershell.exe` or Unix `pwsh`).
 
 The following instance methods will return:
 
@@ -375,7 +375,7 @@ Returns true if the shell is traditionally an OpenVMS shell (e.g. dcl)
 
     my $bool = $shell->is_win32;
 
-Returns true if the shell is traditionally a Windows shell (command.com, cmd.exe)
+Returns true if the shell is traditionally a Windows shell (command.com, cmd.exe, powershell.exe, pwsh)
 
 ## is\_z
 

author.yml

@@ -13,6 +13,8 @@ pod_spelling_system:
     - cmd
     - tc
     - PowerShell
+    - powershell
+    - pwsh
     - prereqs
     - FreeBSD
     - ps

lib/Shell/Guess.pm

@@ -449,7 +449,7 @@ sub korn_shell { bless { korn => 1, bourne => 1, unix => 1, name => 'korn', defa
 
   my $shell = Shell::Guess->power_shell;
 
-Returns an instance of Shell::Guess for Windows PowerShell.
+Returns an instance of Shell::Guess for Microsoft PowerShell (either for Windows C<powershell.exe> or Unix C<pwsh>).
 
 The following instance methods will return:
 
@@ -613,7 +613,7 @@ Returns true if the shell is traditionally an OpenVMS shell (e.g. dcl)
 
  my $bool = $shell->is_win32;
 
-Returns true if the shell is traditionally a Windows shell (command.com, cmd.exe)
+Returns true if the shell is traditionally a Windows shell (command.com, cmd.exe, powershell.exe, pwsh)
 
 =head2 is_z