slightly clarified the "license" portion of `README.md" + formatting all over

added the second change suggested by @nulltoken (with two extra words :) )

README.md

@@ -188,7 +188,7 @@ Check the [contribution guidelines](CONTRIBUTING.md).
 License
 ==================================
 `libgit2` is under GPL2 **with linking exemption**. This means you
-can link to the library with any program, proprietary or open source; paid
+can can link to and use the library from any program, proprietary or open source; paid
 or gratis.  However, you cannot modify libgit2 and distribute it without
 supplying the source.