Fix download_attachments_from_page documentation

[Fusion86]

The docs mention a function with the name download_attachments, but this function does not exist. This doc entry was added in #1283 which also adds the function download_attachments_from_page. I assume it's a simple mistake in the docs, so here a PR to update the docs.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1ccaa1b) 34.37% compared to head (68dec77) 34.37%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1287   +/-   ##
=======================================
  Coverage   34.37%   34.37%           
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  Files          45       45           
  Lines        8235     8235           
  Branches     1145     1145           
=======================================
  Hits         2831     2831           
  Misses       5290     5290           
  Partials      114      114           

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