fixed a character

[captnTardigrade]

volume was misspelled at line 746

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• passes black --check pandas_datareader
• added entry to docs/source/whatsnew/vLATEST.txt

[codecov-commenter]

Codecov Report

Merging #899 (ba309ba) into main (b1247d1) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #899      +/-   ##
==========================================
- Coverage   73.15%   73.09%   -0.07%     
==========================================
  Files          65       65              
  Lines        2932     2932              
  Branches      315      315              
==========================================
- Hits         2145     2143       -2     
- Misses        705      706       +1     
- Partials       82       83       +1     

Impacted Files	Coverage Δ
pandas_datareader/tests/test_iex.py	94.44% <0.00%> (-5.56%)	⬇️

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[bashtage]

Thanks