[ci skip] packaging/Readme.md fix

Author: kulaginm

packaging/Readme.md

@@ -7,7 +7,7 @@ export PBK_EDITION=std|ent
 make pkg
 ```
 
-To build binaries for PostgresPro Standart or Enterprise, a pgpro.tar.bz2 with latest git tree must be preset in `packaging/tarballs` directory:
+To build binaries for PostgresPro Standart or Enterprise, a pgpro.tar.bz2 with latest git tree must be preset in `packaging/pkg/tarballs` directory:
 ```
 cd packaging/pkg/tarballs
 git clone pgpro_repo pgpro