DOC: Fix the default resolution from 1200 to 300 for patterns #8789
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The documentation says the default DPI for patterns is 1200, but actually it's 300 from the source code:
gmt/src/postscriptlight.h
Line 56 in 3f87eb0
I believe it's a typo which can be dated back to even GMT 5.4 (https://docs.generic-mapping-tools.org/5.4/GMT_Docs.html#specifying-area-fill-attributes).
Here is a test to verify that the dpi resolution is 300, not 1200: