Merge pull request #808 from majafranz/fix-doc-typo

Fix typo in the docstring of Differentiator.differentiate_analytic

tensorflow_quantum/python/differentiators/differentiator.py

@@ -331,7 +331,7 @@ def differentiate_analytic(self, programs, symbol_names, symbol_values,
         """Differentiate a circuit with analytical expectation.
 
         This is called at graph runtime by TensorFlow. `differentiate_analytic`
-        calls he inheriting differentiator's `get_gradient_circuits` and uses
+        calls the inheriting differentiator's `get_gradient_circuits` and uses
         those components to construct the gradient.
 
         Note: the default implementation does not use `forward_pass_vals`; the