pgmcrater, pamcrater, pamshadedrelief: add pages (#12401)

pages/common/pamcrater.md

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+# pamcrater
+
+> Create a PAM image of cratered terrain.
+> See also: `pamshadedrelief`, `ppmrelief`.
+> More information: <https://netpbm.sourceforge.net/doc/pamcrater.html>.
+
+- Create an image of cratered terrain with the specified dimensions:
+
+`pamcrater -height {{height}} -width {{width}} > {{path/to/output.pam}}`
+
+- Create an image containing the specified number of craters:
+
+`pamcrater -number {{n_craters}} > {{path/to/output.pam}}`

pages/common/pamshadedrelief.md

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+# pamshadedrelief
+
+> Generate a shaded relief from an elevation map.
+> See also: `pamcrater`, `ppmrelief`.
+> More information: <https://netpbm.sourceforge.net/doc/pamshadedrelief.html>.
+
+- Generate a shaded relief image with the input image interpreted as an elevation map:
+
+`pamshadedrelief < {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Gamma adjust the image by the specified factor:
+
+`pamshadedrelief -gamma {{factor}} < {{path/to/input.pam}} > {{path/to/output.pam}}`

pages/common/pgmcrater.md

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+# pgmcrater
+
+> This command is superseded by `pamcrater`, `pamshadedrelief`, and `pamtopnm`.
+> More information: <https://netpbm.sourceforge.net/doc/pgmcrater.html>.
+
+- View documentation for `pamcrater`:
+
+`tldr pamcrater`
+
+- View documentation for `pamshadedrelief`:
+
+`tldr pamshadedrelief`
+
+- View documentation for `pamtopnm`:
+
+`tldr pamtopnm`