Try to make docstring render correctly

[eliottrosenberg]

Docstring does not render correctly on the website: https://quantumai.google/reference/python/cirq/GeneralizedAmplitudeDampingChannel

Maybe putting this equation on one line will fix it?

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (1366494) 97.88% compared to head (f4f3b22) 97.88%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6283   +/-   ##
=======================================
  Coverage   97.88%   97.88%           
=======================================
  Files        1104     1104           
  Lines       95841    95854   +13     
=======================================
+ Hits        93818    93831   +13     
  Misses       2023     2023           

Files Changed	Coverage Δ
cirq-core/cirq/ops/common_channels.py	99.74% <ø> (ø)
cirq-google/cirq_google/ops/internal_gate.py	100.00% <100.00%> (ø)
cirq-google/cirq_google/ops/internal_gate_test.py	100.00% <100.00%> (ø)

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[dstrain115]

You could also try single "$" and put it on the same line as via. We can try this though.