Correct latest changes

[rlopezcoto]

Correct a few things related to latest PRs:

• the docstring from Rearrange folders #898 (review)
• missing commit from Do not redo link to pro directory if already correct #896 (comment)
• change post_dl2 notebook name after Rearrange folders #898

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[gabemery]

Everything seems correct.

[codecov]

Codecov Report

Merging #900 (8562dbe) into master (6f3fbc2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #900   +/-   ##
=======================================
  Coverage   84.68%   84.68%           
=======================================
  Files          77       77           
  Lines        6074     6074           
=======================================
  Hits         5144     5144           
  Misses        930      930           

Impacted Files	Coverage Δ
lstchain/image/modifier.py	87.91% <ø> (ø)

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