Update cheatsheets

tldr/pamfix

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamfix
+
+> Fix errors in PAM, PBM, PGM and PPM files.
+> See also: `pamfile`, `pamvalidate`.
+> More information: <https://netpbm.sourceforge.net/doc/pamfix.html>.
+
+- Fix a Netpbm file that is missing its last part:
+
+`pamfix -truncate {{path/to/corrupted.ext} > {{path/to/output.ext}}`
+
+- Fix a Netpbm file where pixel values exceed the image's `maxval` by lowering the offending pixels' values:
+
+`pamfix -clip {{path/to/corrupted.ext}} > {{path/to/output.ext}}`
+
+- Fix a Netpbm file where pixel values exceed the image's maxval by increasing it:
+
+`pamfix -changemaxval {{path/to/corrupted.pam|pbm|pgm|ppm}} > {{path/to/output.pam|pbm|pgm|ppm}}`