Fix spelling and typographical errors found by cspell

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/include/mbedtls/rsa.h b/include/mbedtls/rsa.h
index 7562d1c..e43ef96 100644
--- a/include/mbedtls/rsa.h
+++ b/include/mbedtls/rsa.h
@@ -634,7 +634,7 @@
  * \note             The output buffer must be as large as the size
  *                   of ctx->N. For example, 128 Bytes if RSA-1024 is used.
  *
- * \param ctx        The initnialized RSA context to use.
+ * \param ctx        The initialized RSA context to use.
  * \param f_rng      The RNG function to use. This is needed for padding
  *                   generation and is mandatory.
  * \param p_rng      The RNG context to be passed to \p f_rng. This may