[README] fix typo

README.md

@@ -151,7 +151,7 @@ source code [HERE][2] after registration. You can also browse the git repository
 online, following the respective link provided at
 [dev.opencascade.org/resources](https://dev.opencascade.org/index.php?q=home/resources).
 From there, you can download the release tarballs. [Click here][16] to directly
-download the tarball wof the 7.3 release.
+download the tarball of the 7.3 release.
 <!-- EDIT: PUBLIC ACCESS TO THE DEVELOPMENT PORTAL HAS BEEN STOPPED, MAYBE PUT
 THE FOLLOWING PHRASE BACK IN IF THEY RE-OPEN IT!
 , or get the tarballs from their