bpo-20216: Correct docstrings of digest() methods in hashlib. (GH-9873)

diff --git a/Modules/sha512module.c b/Modules/sha512module.c
index d8c846a..e070e43 100644
--- a/Modules/sha512module.c
+++ b/Modules/sha512module.c
@@ -493,12 +493,12 @@
 /*[clinic input]
 SHA512Type.digest
 
-Return the digest value as a string of binary data.
+Return the digest value as a bytes object.
 [clinic start generated code]*/
 
 static PyObject *
 SHA512Type_digest_impl(SHAobject *self)
-/*[clinic end generated code: output=1080bbeeef7dde1b input=60c2cede9e023018]*/
+/*[clinic end generated code: output=1080bbeeef7dde1b input=f6470dd359071f4b]*/
 {
     unsigned char digest[SHA_DIGESTSIZE];
     SHAobject temp;