powershell, pwsh, windows/*: fix PowerShell conventions (#11465)

pages/windows/powershell.md

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+# powershell
+
+> Command-line shell and scripting language designed especially for system administration.
+> This command refers to PowerShell version 5.1 and below (also known as the legacy Windows PowerShell). To use the newer, cross-platform version of PowerShell (also known as PowerShell Core), use `pwsh` instead of `powershell`.
+> More information: <https://learn.microsoft.com/windows-server/administration/windows-commands/powershell>.
+
+- Start an interactive shell session:
+
+`powershell`
+
+- Start an interactive shell session without loading startup configs:
+
+`powershell -NoProfile`
+
+- Execute specific commands:
+
+`powershell -Command "{{echo 'powershell is executed'}}"`
+
+- Execute a specific script:
+
+`powershell -File {{path/to/script.ps1}}`
+
+- Start a session with a specific version of PowerShell:
+
+`powershell -Version {{version}}`
+
+- Prevent a shell from exit after running startup commands:
+
+`powershell -NoExit`
+
+- Describe the format of data sent to PowerShell:
+
+`powershell -InputFormat {{Text|XML}}`
+
+- Determine how an output from PowerShell is formatted:
+
+`powershell -OutputFormat {{Text|XML}}`