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 :white_check_mark:

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

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Additional details and impacted files

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

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