cd, chdir, set-location, sl: add PowerShell alias and standardize page (#11209)

pages/windows/chdir.md

@@ -0,0 +1,12 @@
+# chdir
+
+> This command is an alias of `cd` in Command Prompt, and subsequently `Set-Location` in PowerShell.
+> More information: <https://learn.microsoft.com/windows-server/administration/windows-commands/chdir>.
+
+- View documentation for the original Command Prompt command:
+
+`tldr cd`
+
+- View documentation for the original PowerShell command:
+
+`tldr set-location`