pamscale, pnmscale, pnmscalefixed: add pages (#11779)

pages/common/pamscale.md

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+# pamscale
+
+> Scale a Netpbm image.
+> More information: <https://netpbm.sourceforge.net/doc/pamscale.html>.
+
+- Scale an image such that the result has the specified dimensions:
+
+`pamscale -width {{width}} -height {{height}} {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Scale an image such that the result has the specified width, keeping the aspect ratio:
+
+`pamscale -width {{width}} {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Scale an image such that its width and height is changed by the specified factors:
+
+`pamscale -xscale {{x_factor}} -yscale {{y_factor}} {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Scale an image such that it fits into the specified bounding box while preserving its aspect ratio:
+
+`pamscale -xyfit {{bbox_width}} {{bbox_height}} {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Scale an image such that it completely fills the specified box while preserving its aspect ratio:
+
+`pamscale -xyfill {{box_width}} {{box_height}} {{path/to/input.pam}} > {{path/to/output.pam}}`

pages/common/pnmscale.md

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+# pnmscale
+
+> This command has been replaced by `pamscale`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmscale.html>.
+
+- View documentation for `pamscale`:
+
+`tldr pamscale`

pages/common/pnmscalefixed.md

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+# pnmscalefixed
+
+> Scale a PNM file quickly with possibly reduced quality.
+> See also: `pamscale`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmscalefixed.html>.
+
+- Scale an image such that the result has the specified dimensions:
+
+`pnmscalefixed -width {{width}} -height {{height}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`
+
+- Scale an image such that the result has the specified width, keeping the aspect ratio:
+
+`pnmscalefixed -width {{width}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`
+
+- Scale an image such that its width and height is changed by the specified factors:
+
+`pnmscalefixed -xscale {{x_factor}} -yscale {{y_factor}} {{path/to/input.pnm}} > {{path/to/output.pnm}}`