doc: Fix description of EVP_CIPHER_CTX_dup

This fixes a couple of copy and paste error from EVP_MD_CTX_dup,
where: EVP_CIPHER_CTX_dup is useful to avoid multiple
EVP_CIPHER_fetch (instead of EVP_MD_fetch) and returns
EVP_CIPHER_CTX (instead of EVP_MD_CTX).

Signed-off-by: Daiki Ueno <dueno@redhat.com>

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/24376)

(cherry picked from commit 7860bca22c404cfd763ae2648d708d5cc4df6c2f)

doc/man3/EVP_EncryptInit.pod

@@ -287,8 +287,8 @@ remain in memory.
 =item EVP_CIPHER_CTX_dup()
 
 Can be used to duplicate the cipher state from I<in>.  This is useful
-to avoid multiple EVP_MD_fetch() calls or if large amounts of data are to be
-hashed which only differ in the last few bytes.
+to avoid multiple EVP_CIPHER_fetch() calls or if large amounts of data are to be
+fed which only differ in the last few bytes.
 
 =item EVP_CIPHER_CTX_copy()
 
@@ -1241,7 +1241,7 @@ EVP_CIPHER_up_ref() returns 1 for success or 0 otherwise.
 EVP_CIPHER_CTX_new() returns a pointer to a newly created
 B<EVP_CIPHER_CTX> for success and B<NULL> for failure.
 
-EVP_CIPHER_CTX_dup() returns a new EVP_MD_CTX if successful or NULL on failure.
+EVP_CIPHER_CTX_dup() returns a new EVP_CIPHER_CTX if successful or NULL on failure.
 
 EVP_CIPHER_CTX_copy() returns 1 if successful or 0 for failure.