fmtutil, fmtutil-sys, fmtutil-user, mktexfmt: add pages (#23091)

pages/common/fmtutil-sys.md

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+# fmtutil-sys
+
+> Manage TeX formats and Metafont bases system-wide.
+> More information: <https://manned.org/fmtutil-sys>.
+
+- Recreate all system format files:
+
+`fmtutil-sys --all`
+
+- Create all missing system format files:
+
+`fmtutil-sys --missing`
+
+- Recreate a specific system format:
+
+`fmtutil-sys --byfmt {{format}}`
+
+- List configured formats:
+
+`fmtutil-sys --listcfg`

pages/common/fmtutil-user.md

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+# fmtutil-user
+
+> Manage TeX formats and Metafont bases for the current user.
+> More information: <https://manned.org/fmtutil-sys>.
+
+- Recreate all user format files:
+
+`fmtutil-user --all`
+
+- Create all missing user format files:
+
+`fmtutil-user --missing`
+
+- Recreate a specific user format:
+
+`fmtutil-user --byfmt {{format}}`
+
+- Recreate all formats built with a specific engine:
+
+`fmtutil-user --byengine {{engine}}`
+
+- List all available format configurations:
+
+`fmtutil-user --listcfg`

pages/common/fmtutil.md

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+# fmtutil
+
+> Manage TeX formats and Metafont bases.
+> More information: <https://manned.org/fmtutil-sys>.
+
+- Recreate all format files:
+
+`fmtutil --all`
+
+- Create all missing format files:
+
+`fmtutil --missing`
+
+- List available format configurations:
+
+`fmtutil --listcfg`
+
+- Recreate formats built with a specific engine:
+
+`fmtutil --byengine {{engine}}`
+
+- Recreate a specific format:
+
+`fmtutil --byfmt {{format}}`

pages/common/mktexfmt.md

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+# mktexfmt
+
+> Create a TeX format or Metafont base.
+> More information: <https://manned.org/fmtutil-sys>.
+
+- Create a format:
+
+`mktexfmt {{format}}`
+
+- Display version information:
+
+`mktexfmt --version`
+
+- Display help:
+
+`mktexfmt --help`