Fix typos

[skip ci]

README.NEW-OUTPUT-API

@@ -18,7 +18,7 @@ API adjustment to the old output control code:
 		// php_start_ob_buffer(zhandler, chunk_size, erase);
 		php_output_start_user(zhandler, chunk_size, flags);
 
-	Starting an internal handler whithout context:
+	Starting an internal handler without context:
 		// php_ob_set_internal_handler(my_php_output_handler_func_t, buffer_size, "output handler name", erase);
 		php_output_start_internal(handler_name, handler_name_len, my_php_output_handler_func_t, chunk_size, flags);
 

UPGRADING

@@ -61,7 +61,7 @@ PHP 7.2 UPGRADE NOTES
 
 - Session:
   . Removed register_globals related code and "!" can be used as $_SESSION key name.
-  . Session is made to manage session status corretly and prevents invalid operations.
+  . Session is made to manage session status correctly and prevents invalid operations.
     Only inappropriate codes are affected by this change. If you have problems with this,
     it means you have problem in your code.
     . Functions are made to set or return correct session status.
@@ -173,7 +173,7 @@ See also: https://wiki.php.net/rfc/deprecations_php_7_2
     'PASSWORD_ARGON2_DEFAULT_TIME_COST', and 'PASSWORD_ARGON2_DEFAULT_THREADS' respectively if not set.
   . password_verify() can verify Argon2i hashes.
   . password_get_info() and password_needs_rehash() can accept Argon2i hashes.
-  . mail()/mb_send_mail() accept array $extra_header. Array paramter is checked against RFC 2822.
+  . mail()/mb_send_mail() accept array $extra_header. Array parameter is checked against RFC 2822.
     Array format is 
     $extra_headers = [
       'Header-Name' => 'Header value',