Documentation refers to PPP_CONFIG_DIR

[adybbroe]

Code Sample, a minimal, complete, and verifiable piece of code

# Your code here

Problem description

Documentation mention PPP_CONFIG_DIR. Nowadays it should be SATPY_CONFIIG_DIR I believe.

Expected Output

Actual Result, Traceback if applicable

Versions of Python, package at hand and relevant dependencies

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[djhoese]

The code uses it too. Pyorbital is an independent package from Satpy. It seems odd that it would refer to Satpy's configuration environment variables and path.