Correct project name and fix text errors in README

[samwaseda]

Updated the README to correct the project name from 'Sphinx' to 'Sphinx Parser' and fixed minor text errors.

[github-actions]

👈 Launch a binder notebook on branch pyiron/sphinx_parser/samwaseda-patch-1

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.54%. Comparing base (d127a0b) to head (ec7ce03).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #71   +/-   ##
=======================================
  Coverage   88.54%   88.54%           
=======================================
  Files           8        8           
  Lines         812      812           
=======================================
  Hits          719      719           
  Misses         93       93           

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