fix documentation

PR: 1343

doc/crypto/BIO_set_callback.pod

@@ -17,7 +17,7 @@ BIO_debug_callback - BIO callback functions
  long BIO_debug_callback(BIO *bio,int cmd,const char *argp,int argi,
 	long argl,long ret);
 
- typedef long callback(BIO *b, int oper, const char *argp,
+ typedef long (*callback)(BIO *b, int oper, const char *argp,
 			int argi, long argl, long retvalue);
 
 =head1 DESCRIPTION

doc/crypto/RSA_get_ex_new_index.pod

@@ -17,12 +17,12 @@ RSA_get_ex_new_index, RSA_set_ex_data, RSA_get_ex_data - add application specifi
 
  void *RSA_get_ex_data(RSA *r, int idx);
 
- typedef int new_func(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
-		int idx, long argl, void *argp);
- typedef void free_func(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
-		int idx, long argl, void *argp);
- typedef int dup_func(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d, 
-		int idx, long argl, void *argp);
+ typedef int CRYPTO_EX_new(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
+                           int idx, long argl, void *argp);
+ typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
+                             int idx, long argl, void *argp);
+ typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d,
+                           int idx, long argl, void *argp);
 
 =head1 DESCRIPTION
 

doc/ssl/SSL_CTX_set_tmp_rsa_callback.pod

@@ -18,7 +18,7 @@ SSL_CTX_set_tmp_rsa_callback, SSL_CTX_set_tmp_rsa, SSL_CTX_need_tmp_rsa, SSL_set
  long SSL_set_tmp_rsa(SSL *ssl, RSA *rsa)
  long SSL_need_tmp_rsa(SSL *ssl)
 
- RSA *(*tmp_rsa_callback)(SSL *ssl, int is_export, int keylength));
+ RSA *(*tmp_rsa_callback)(SSL *ssl, int is_export, int keylength);
 
 =head1 DESCRIPTION