Fix a/an typos in doxygen and other comments
Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/include/mbedtls/rsa.h b/include/mbedtls/rsa.h
index e43ef96..002551f 100644
--- a/include/mbedtls/rsa.h
+++ b/include/mbedtls/rsa.h
@@ -479,7 +479,7 @@
* the current function does not have access to them,
* and therefore cannot check them. See mbedtls_rsa_complete().
* If you want to check the consistency of the entire
- * content of an PKCS1-encoded RSA private key, for example, you
+ * content of a PKCS1-encoded RSA private key, for example, you
* should use mbedtls_rsa_validate_params() before setting
* up the RSA context.
* Additionally, if the implementation performs empirical checks,