Fix two latex issues in docs (#13388)

* Fix two latex issues in docs

* Add white space

qiskit/quantum_info/operators/operator.py

@@ -547,7 +547,7 @@ def power(self, n: float, branch_cut_rotation=cmath.pi * 1e-12) -> Operator:
         Non-integer powers of operators with an eigenvalue whose complex phase is :math:`\\pi` have
         a branch cut in the complex plane, which makes the calculation of the principal root around
         this cut subject to precision / differences in BLAS implementation.  For example, the square
-        root of Pauli Y can return the :math:`\\pi/2` or :math:`\\-pi/2` Y rotation depending on
+        root of Pauli Y can return the :math:`\\pi/2` or :math:`-\\pi/2` Y rotation depending on
         whether the -1 eigenvalue is found as ``complex(-1, tiny)`` or ``complex(-1, -tiny)``. Such
         eigenvalues are really common in quantum information, so this function first phase-rotates
         the input matrix to shift the branch cut to a far less common point.  The underlying

qiskit/transpiler/passes/optimization/remove_identity_equiv.py

@@ -33,7 +33,7 @@ class RemoveIdentityEquivalent(TransformationPass):
 
     .. math::
 
-        \bar{F} = \frac{1 + F_{\text{process}}{1 + d}
+        \bar{F} = \frac{1 + F_{\text{process}}}{1 + d},\ 
 
         F_{\text{process}} = \frac{|\mathrm{Tr}(G)|^2}{d^2}