Docs Update

[ankur-soni97]

Description: Updated missing Z value of Oxygen in abundancecust.rst

Motivation and Context

How Has This Been Tested?

• Testing pipeline
• Reference Data Comparison following these instructions
• Other (Just completed the line seeing the pattern of doc)

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• None of the above (please describe)

Checklist:

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have built the documentation on my fork following these instructions
• I have assigned and requested two reviewers for this pull request

[codecov]

Codecov Report

Merging #1474 (0846acf) into master (50f13ba) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1474   +/-   ##
=======================================
  Coverage   71.13%   71.13%           
=======================================
  Files          67       67           
  Lines        5523     5523           
=======================================
  Hits         3929     3929           
  Misses       1594     1594           

Impacted Files	Coverage Δ
tardis/tardis/io/util.py	72.09% <0.00%> (ø)
tardis/tardis/montecarlo/base.py	86.20% <0.00%> (ø)

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[isaacgsmith]

Pretty solid. Just because I saw it missing on the checklist, even though it shouldn't make a difference with just the small change you made, it's a good habit to build the documentation when you make any changes to it.