fix typo in docs for curve name (#3705)

fixes #3704
diff --git a/docs/hazmat/primitives/asymmetric/ec.rst b/docs/hazmat/primitives/asymmetric/ec.rst
index 113168f..614d7a3 100644
--- a/docs/hazmat/primitives/asymmetric/ec.rst
+++ b/docs/hazmat/primitives/asymmetric/ec.rst
@@ -374,7 +374,7 @@
     SECG curve ``secp256r1``. Also called NIST P-256.
 
 
-.. class:: SECT224R1
+.. class:: SECP224R1
 
     .. versionadded:: 0.5