docs: update interval text in introduction

[valankar]

Update text to reflect the 24 hour default checking time.

[github-actions]

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e8affe3) 67.60% compared to head (aad6b94) 67.60%.
Report is 1 commits behind head on main.

Additional details and impacted files

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  Coverage   67.60%   67.60%           
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  Files          26       26           
  Lines        2380     2380           
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  Hits         1609     1609           
  Misses        672      672           
  Partials       99       99           

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[piksel]

That introduction text is very vague about the configuration used, but I guess it's better to assume that it's using the default schedule. Thanks!