Fix a typo in the documentation (#7330)

Author: caugonnet

libcudacxx/include/cuda/__memory_pool/device_memory_pool.h

@@ -97,7 +97,7 @@ class device_memory_pool_ref : public __memory_pool_base
 //! ``device_memory_pool`` allocates device memory using
 //! `cudaMallocFromPoolAsync / cudaFreeAsync
 //! <https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__MEMORY__POOLS.html>`__
-//! for allocation/deallocation. A When constructed it creates an underlying \c
+//! for allocation/deallocation. When constructed it creates an underlying \c
 //! cudaMemPool_t with the location type set to \c cudaMemLocationTypeDevice and
 //! owns it.
 //!

libcudacxx/include/cuda/__memory_pool/managed_memory_pool.h

@@ -94,7 +94,7 @@ class managed_memory_pool_ref : public __memory_pool_base
 //! ``managed_memory_pool`` allocates managed memory using
 //! `cudaMallocFromPoolAsync / cudaFreeAsync
 //! <https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__MEMORY__POOLS.html>`__
-//! for allocation/deallocation. A When constructed it creates an underlying \c
+//! for allocation/deallocation. When constructed it creates an underlying \c
 //! cudaMemPool_t with the allocation type set to \c
 //! cudaMemAllocationTypeManaged and owns it.
 //!