init/exit: mention these were added in 1.2.5

docs/libssh2_exit.3

@@ -6,9 +6,9 @@ libssh2_exit - global library deinitialization
 
 int
 libssh2_exit(void);
-
 .SH DESCRIPTION
 Exit the libssh2 functions and free's all memory used internal.
-
+.SH AVAILABILITY
+Added in libssh2 1.2.5
 .SH SEE ALSO
 .BR libssh2_init(3)

docs/libssh2_init.3

@@ -8,14 +8,13 @@ libssh2_init - global library initialization
 
 int
 libssh2_init(int flags);
-
 .SH DESCRIPTION
 Initialize the libssh2 functions.  This typically initialize the
 crypto library.  It uses a global state, and is not thread safe -- you
 must make sure this function is not called concurrently.
-
 .SH RETURN VALUE
 Returns 0 if succeeded, or a negative value for error.
-
+.SH AVAILABILITY
+Added in libssh2 1.2.5
 .SH SEE ALSO
 .BR libssh2_exit(3)