Use lower case for p and r
* they must be set up and associated with the modulus \c N. Some
* functions (typically constant-flow) require that the limbs in an
* output residue are initialized.
- * - Bignum parameters called \c P are inputs used to set up a modulus or
+ * - Bignum parameters called \c p are inputs used to set up a modulus or
* residue. These must be pointers to an array of limbs.
* - \c T is a temporary storage area. The initial content of such a
* parameter is ignored and the final content is unspecified.
- * - Some functions use different names, such as \c R for the residue.
+ * - Some functions use different names, such as \c r for the residue.
* - **Bignum sizes**: bignum sizes are always expressed in limbs. Both
* #mbedtls_mpi_mod_modulus and #mbedtls_mpi_mod_residue have a \c limbs
* member storing its size. All bignum parameters must have the same
