Fix typos found by codespell (#1519)

bindings/python/google_benchmark/__init__.py

diff --git a/bindings/python/google_benchmark/__init__.py b/bindings/python/google_benchmark/__init__.py
index 10f5d5d..e6ef8e7 100644
--- a/bindings/python/google_benchmark/__init__.py
+++ b/bindings/python/google_benchmark/__init__.py
@@ -104,7 +104,7 @@
                 options = self.make(func_or_options)
                 options.builder_calls.append((builder_name, args, kwargs))
                 # The decorator returns Options so it is not technically a decorator
-                # and needs a final call to @regiser
+                # and needs a final call to @register
                 return options
 
             return __decorator

bindings/python/google_benchmark/example.py

diff --git a/bindings/python/google_benchmark/example.py b/bindings/python/google_benchmark/example.py
index 487acc9..d95a043 100644
--- a/bindings/python/google_benchmark/example.py
+++ b/bindings/python/google_benchmark/example.py
@@ -72,7 +72,7 @@
 
 @benchmark.register
 def custom_counters(state):
-    """Collect cutom metric using benchmark.Counter."""
+    """Collect custom metric using benchmark.Counter."""
     num_foo = 0.0
     while state:
         # Benchmark some code here