Update cheatsheets

pamstretch

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamstretch
+
+> Scale up a PAM image by interpolating between pixels.
+> See also: `pamstretch-gen`, `pamenlarge`, `pamscale`.
+> More information: <https://netpbm.sourceforge.net/doc/pamstretch.html>.
+
+- Scale up a PAM image by an integer factor:
+
+`pamstretch {{N}} {{path/to/image.pam}} > {{path/to/output.pam}}`
+
+- Scale up a PAM image by the specified factors in the horizontal and vertical directions:
+
+`pamstretch -xscale {{XN}} -yscale {{YN}} {{path/to/image.pam}} > {{path/to/output.pam}}`