flatpak-{mask, update, remote-info}: add page (#14853)

pages/linux/flatpak-mask.md

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+# flatpak mask
+
+> Mask out updates and automatic installation.
+> More information: <https://docs.flatpak.org/en/latest/flatpak-command-reference.html#flatpak-mask>.
+
+- Ignore updates for a specific flatpak:
+
+`flatpak mask {{com.example.app}}`
+
+- Undo ignore updates:
+
+`flatpak mask --remove {{com.example.app}}`
+
+- List all currently masked patterns:
+
+`flatpak mask {{--system|--user}}`

pages/linux/flatpak-remote-info.md

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+# flatpak remote-info
+
+> Show information about an application or runtime in a remote.
+> More information: <https://docs.flatpak.org/en/latest/flatpak-command-reference.html#flatpak-remote-info>.
+
+- Show information about a flatpak:
+
+`flatpak remote-info {{remote_name}} {{com.example.app}}`
+
+- Show a log of previous versions in a remote:
+
+`flatpak remote-info --log {{remote_name}} {{com.example.app}}`
+
+- Show information about the specific commit, rather than the latest version:
+
+`flatpak remote-info --commit={{COMMIT}} {{remote_name}} {{com.example.app}}`

pages/linux/flatpak-update.md

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+# flatpak update
+
+> Update flatpak applications and runtimes.
+> More information: <https://docs.flatpak.org/en/latest/flatpak-command-reference.html#flatpak-update>.
+
+- Update all installed applications and runtimes (use `-y` to confirm all prompts automatically):
+
+`flatpak update`
+
+- Update only a specific app:
+
+`flatpak update {{com.example.app}}`
+
+- Update/Downgrade to a specific commit (also see flatpak remote-info and flatpak mask):
+
+`flatpak update --commit={{COMMIT}} {{com.example.app}}`