Fix default init_buffer_size to be 512 KiB

[jkalez]

The docs specify that init_buffer_size's default value is 512 KiB. However it's actually 512 MiB (512 * 1024 * 1024 == 512 MiB). This PR updates the docs. An alternative approach could be to change the default; I'm not sure which is better.

[inflation]

It's probably a mistake of the code. I would keep it at 512 KiB or 1 MiB for the default value.

[jkalez]

Changed the PR to change the default init_buffer_size instead of changing the documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.23%. Comparing base (0444c91) to head (63d856b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #112   +/-   ##
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  Coverage   98.23%   98.23%           
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  Files          15       15           
  Lines         849      849           
=======================================
  Hits          834      834           
  Misses         15       15           

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