pamnoraw, pamtopam, pamtopnm, pnmtoplainpnm, pnmtopnm, ppmtoppm: add pages (#11403)

* pamnoraw, pamtopam, pamtopnm, pnmtoplainpnm, pnmtopnm, ppmtoppm: add pages

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Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>

pages/common/pamnoraw.md

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+# pamnoraw
+
+> This command is an alias of `pamtopnm -plain`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmnoraw.html>.
+
+- View documentation for the original command:
+
+`tldr pamtopnm`

pages/common/pamtopam.md

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+# pamtopam
+
+> Copy a PAM image.
+> More information: <https://netpbm.sourceforge.net/doc/pamtopam.html>.
+
+- Copy a PAM image (i.e. a PBM, PGM, PPM or PAM image) from `stdin` to `stdout`:
+
+`pamtopam < {{path/to/image.pam}} > {{path/to/output.pam}}`
+
+- Display version:
+
+`pamtopam -version`

pages/common/pamtopnm.md

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+# pamtopnm
+
+> Convert a PAM image to an equivalent PNM image.
+> More information: <https://netpbm.sourceforge.net/doc/pamtopnm.html>.
+
+- Convert a PAM image to an equivalent PNM image, i.e. a PBM, PGM or PPM image:
+
+`pamtopnm {{path/to/image.pam}} > {{path/to/output.pbm|pgm|ppm}}`
+
+- Display version:
+
+`pamtopnm -version`

pages/common/pnmtoplainpnm.md

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+# pnmtoplainpnm
+
+> This command is an alias of `pamtopnm -plain`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtoplainpnm.html>.
+
+- View documentation for the original command:
+
+`tldr pamtopnm`

pages/common/pnmtopnm.md

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+# pnmtopnm
+
+> This command is an alias of `pamtopnm`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtopnm.html>.
+
+- View documentation for the original command:
+
+`tldr pamtopnm`

pages/common/ppmtoppm.md

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+# ppmtoppm
+
+> Copy a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtoppm.html>.
+
+- Copy a PPM image (i.e. a PBM, PGM or PPM image) from `stdin` to `stdout`:
+
+`ppmtoppm < {{path/to/image.ppm}} > {{path/to/output.ppm}}`
+
+- Display version:
+
+`ppmtoppm -version`