[Rust] [DataFusion] README has invalid github URL

[asfimport]

README has:

git clone https://github/apache/arrow

but should be:

git clone https://github.com/apache/arrow

Reporter: Adam Lippai / @alippai
Assignee: Andy Grove / @andygrove

PRs and other links:

• GitHub Pull Request #5499

_{Note: This issue was originally created as ARROW-6705. Please see the migration documentation for further details.}

[asfimport]

Andy Grove / @andygrove:
Issue resolved by pull request 5499
#5499