Add construction examples to docstrings of ClassicallyControlledOperation

[justinpan0]

To address #4883, added construction usage:

"""
Examples:
        q0, q1, q2 = cirq.LineQubit.range(3)
        # Apply X if measurement was non-zero (single condition)
        circuit = cirq.Circuit(
            cirq.measure(q0, key='control_key'),
            cirq.X(q1).with_classical_controls('control_key')
        )
        # Apply X if both measurements were non-zero (multiple conditions)
        circuit = cirq.Circuit([
            cirq.measure(q0, key='control_key1'),
            cirq.measure(q1, key='control_key2'),
            cirq.X(q2).with_classical_controls('control_key1', 'control_key2')  
        ])
"""

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.86%. Comparing base (83a8e0e) to head (06260ce).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6913      +/-   ##
==========================================
- Coverage   97.86%   97.86%   -0.01%     
==========================================
  Files        1084     1084              
  Lines       94290    94290              
==========================================
- Hits        92280    92279       -1     
- Misses       2010     2011       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.