Issue #544: fixing minor typos in 2 vignettes

[cherz4]

Description

This PR closes #544

line 84 recive -> receive in epidist.Rmd
line 49 the -> is in approx-inference.Rmd

Checklist

• My PR is based on a package issue and I have explicitly linked it.
• I have included the target issue or issues in the PR title in the for Issue(s) issue-numbers: PR title
• I have read the contribution guidelines.
• I have tested my changes locally.
• I have added or updated unit tests where necessary.
• I have updated the documentation if required.
• My code follows the established coding standards.
• I have added a news item linked to this PR.
• I have reviewed CI checks for this PR and addressed them as far as I am able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.59%. Comparing base (556accc) to head (b50e795).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #545   +/-   ##
=======================================
  Coverage   95.59%   95.59%           
=======================================
  Files          17       17           
  Lines         998      998           
=======================================
  Hits          954      954           
  Misses         44       44           

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[seabbs]

Thanks @cherz4!