docs: Fix a few typos

[timgates42]

There are small typos in:

• docs/README.rst
• docs/secure_downloads.rst
• filer/admin/folderadmin.py
• filer/models/foldermodels.py
• filer/templatetags/filer_admin_tags.py
• filer/thumbnail_processors.py
• tests/helpers.py
• tests/test_admin.py

Fixes:

• Should read suitable rather than suitiable.
• Should read rendered rather than redered.
• Should read outer rather than owter.
• Should read permission rather than permisison.
• Should read library rather than libary.
• Should read initial rather than inital.
• Should read ellipse rather than elipse.
• Should read deletable rather than deleteable.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

[codecov[bot]]

Codecov Report

Merging #1309 (280d8e0) into master (fd60809) will increase coverage by 11.45%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1309       +/-   ##
===========================================
+ Coverage   60.75%   72.21%   +11.45%     
===========================================
  Files          72       72               
  Lines        3239     3239               
  Branches      563      563               
===========================================
+ Hits         1968     2339      +371     
+ Misses       1117      734      -383     
- Partials      154      166       +12     

Impacted Files	Coverage Δ
filer/admin/folderadmin.py	71.82% <ø> (+14.59%)	:arrow_up:
filer/models/foldermodels.py	86.47% <ø> (+20.28%)	:arrow_up:
filer/templatetags/filer_admin_tags.py	86.56% <ø> (+5.97%)	:arrow_up:
filer/thumbnail_processors.py	38.46% <ø> (+20.87%)	:arrow_up:
filer/admin/tools.py	76.81% <0.00%> (+1.44%)	:arrow_up:
filer/admin/forms.py	68.29% <0.00%> (+2.43%)	:arrow_up:
filer/models/filemodels.py	86.54% <0.00%> (+3.58%)	:arrow_up:
filer/templatetags/filer_tags.py	41.50% <0.00%> (+5.66%)	:arrow_up:
filer/models/abstract.py	81.51% <0.00%> (+7.56%)	:arrow_up:
... and 19 more

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[marksweb]

It might be worth implementing codespell like we have on django-cms as a github action and pre-commit hook;

https://github.com/django-cms/django-cms/blob/develop/.github/workflows/spelling.yml

https://github.com/django-cms/django-cms/blob/develop/.pre-commit-config.yaml