Correct minor typo in BitMaskKeyCondition (#7251)

* Correct minor typo in BitMaskKeyCondition

- Noticed it while using the example code.

* Fix the same typo in a notebook

* Typo - transfomer -> transformer

---------

Co-authored-by: Michael Hucka <[email protected]>
Co-authored-by: Pavol Juhas <[email protected]>

Author: 3 people

cirq-core/cirq/value/condition.py

@@ -144,7 +144,7 @@ class BitMaskKeyCondition(Condition):
     after taking the bitwise and with a bitmask.
 
     Examples:
-        - BitMaskKeycondition('a') -> a != 0
+        - BitMaskKeyCondition('a') -> a != 0
         - BitMaskKeyCondition('a', bitmask=13) -> (a & 13) != 0
         - BitMaskKeyCondition('a', bitmask=13, target_value=9) -> (a & 13) != 9
         - BitMaskKeyCondition('a', bitmask=13, target_value=9, equal_target=True) -> (a & 13) == 9

docs/build/classical_control.ipynb

@@ -200,7 +200,7 @@
     "## Multi-Qubit Measurements and Bit Masks\n",
     "\n",
     "The `cirq.KeyedCondition` class limited in that it evaluate a simple function `is the value != 0?`. When doing multi-qubit measurement we often need to do more complex function like applying a bitmask before comparison. The class [cirq.BitMaskKeyCondition](https://github.com/quantumlib/Cirq/blob/ebef9bff978f28b032f54eb5f0a2e1cb9ec6464c/cirq-core/cirq/value/condition.py#L140) provides this functionality allowing us to do:\n",
-    "- `BitMaskKeycondition('a')` $\\rightarrow a \\neq 0$\n",
+    "- `BitMaskKeyCondition('a')` $\\rightarrow a \\neq 0$\n",
     "- `BitMaskKeyCondition('a', bitmask=13)` $\\rightarrow  (a \\& 13) \\neq 0$\n",
     "- `BitMaskKeyCondition('a', bitmask=13, target_value=9)` $\\rightarrow  (a \\& 13) \\neq 9$\n",
     "- `BitMaskKeyCondition('a', bitmask=13, target_value=9, equal_target=True)` $\\rightarrow  (a \\& 13) = 9$\n",

docs/transform/custom_transformers.ipynb

@@ -165,7 +165,7 @@
    },
    "source": [
     "### `cirq.TransformerLogger` and support for automated logging\n",
-    "The `cirq.TransformerLogger` class is used to log the actions of a transformer on an input circuit. `@cirq.transformer` decorator automatically adds support for logging the initial and final circuits for each transfomer step. "
+    "The `cirq.TransformerLogger` class is used to log the actions of a transformer on an input circuit. `@cirq.transformer` decorator automatically adds support for logging the initial and final circuits for each transformer step. "
    ]
   },
   {

docs/transform/routing_transformer.ipynb

@@ -96,7 +96,7 @@
     "id": "ot9EMHfg0175"
    },
    "source": [
-    "## Routing as a `@cirq.transfomer`"
+    "## Routing as a `@cirq.transformer`"
    ]
   },
   {