Update doc/benchmarks.rst

Co-authored-by: Kumar Aditya <[email protected]>

Author: mdboom

doc/benchmarks.rst

@@ -135,7 +135,7 @@ ctypes
 
 Benchmark to measure the function call overhead of calling C functions using ctypes.
 
-The `ctypes` benchmark lets `ctypes` infer the argument types from the passed in
+The ``ctypes`` benchmark lets ``ctypes`` infer the argument types from the passed in
 values. The `ctypes_argtypes` benchmark `explicitly specifies the argument types
 <https://docs.python.org/3.10/library/ctypes.html?highlight=ctypes#specifying-the-required-argument-types-function-prototypes>`_,
 which is slower than inferred argument types.