Fix typos in upgrade notes

Author: theodorejb

UPGRADING

@@ -269,13 +269,13 @@ PHP 7.4 UPGRADE NOTES
 
 - SPL:
   . SplFileObject::fputcsv(), ::fgetcsv() and ::setCsvControl() now accept an
-    empty string as $escape argument, which disables the propriertary PHP
+    empty string as $escape argument, which disables the proprietary PHP
     escaping mechanism. SplFileObject::getCsvControl() now may also return an
     empty string for the third array element, accordingly.
 
 - Standard:
   . fputcsv() and fgetcsv() now accept an empty string as $escape argument,
-    which disables the propriertary PHP escaping mechanism. The behavior of
+    which disables the proprietary PHP escaping mechanism. The behavior of
     str_getcsv() has been adjusted accordingly (formerly, an empty string was
     identical to using the default).
   . proc_open() on Windows can be passed a "create_process_group" option. It