Fix performance advice to match --fast-web-view documentation

[Androbin]

The current performance advice does not match the documentation of the flag:

--fast-web-view MEGABYTES
If the size of file is more than this threshold (in MB), then linearize the PDF for fast web viewing. This allows the PDF to be displayed before it is fully downloaded in web browsers, but increases the space required slightly. By default we skip this for small files which do not benefit. If the threshold is 0 it will be apply to all files. Set the threshold very high to disable.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9489c01) 90.29% compared to head (7702d01) 90.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1206      +/-   ##
==========================================
- Coverage   90.29%   90.24%   -0.05%     
==========================================
  Files          94       94              
  Lines        6830     6830              
  Branches     1224     1224              
==========================================
- Hits         6167     6164       -3     
- Misses        463      465       +2     
- Partials      200      201       +1     

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