Fix the number of equation for fidelity function gaussian_checks.py

[gabrimoreira]

Context:
Minor fix in the documentation.

Description of the Change:
Corrected a reference to equation fidelity from 96 to 112.

Benefits:
Fix the documentation reference.

Possible Drawbacks:
None.

Related GitHub Issues:
N/A

[ziofil]

I'm pushing this forward since it seems it has been abandoned

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (12633ca) to head (c8924c1).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #397   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         1922      1925    +3     
=========================================
+ Hits          1922      1925    +3     

Files with missing lines	Coverage Δ
thewalrus/quantum/gaussian_checks.py	100.00% <ø> (ø)

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