Small doc changes (#1831)

Co-authored-by: Kevin Tian <[email protected]>

qiskit_ibm_runtime/options/twirling_options.py

@@ -30,7 +30,7 @@ class TwirlingOptions:
     """Twirling options. This is only used by V2 primitives.
 
     Args:
-        enable_gates: Whether to apply 2-qubit gate twirling. Default: False.
+        enable_gates: Whether to apply 2-qubit Clifford gate twirling. Default: False.
 
         enable_measure: Whether to enable twirling of measurements. Twirling will only be applied to
          those measurement registers not involved within a conditional logic.

qiskit_ibm_runtime/qiskit_runtime_service.py

@@ -491,7 +491,7 @@ def backends(
                     )
             use_fractional_gates: Set True to allow for the backends to include
                 fractional gates in target. Currently this feature cannot be used
-                simulataneously with the dynamic circuits, PEC, or PEA.
+                simulataneously with dynamic circuits, PEC, PEA, or gate twirling.
                 When this flag is set, control flow instructions are automatically
                 removed from the backend target.
                 When you use the dynamic circuits feature (e.g. if_else) in your
@@ -760,7 +760,7 @@ def backend(
                 For users without access to a premium provider, the default open provider will be used.
             use_fractional_gates: Set True to allow for the backends to include
                 fractional gates in target. Currently this feature cannot be used
-                simulataneously with the dynamic circuits, PEC, or PEA.
+                simulataneously with dynamic circuits, PEC, PEA, or gate twirling.
                 When this flag is set, control flow instructions are automatically
                 removed from the backend target.
                 When you use the dynamic circuits feature (e.g. if_else) in your