Auto merge of #5527 - tcr:patch-1, r=alexcrichton
Auto merge of #5527 - tcr:patch-1, r=alexcrichton

Point Source Replacement to the Overriding Dependencies section

This would've saved me a minute. This mirrors a similarly helpful caveat in [the [patch] section](https://doc.rust-lang.org/cargo/reference/manifest.html#the-patch-section).

eminence/cargo,rustyhorde/cargo,nipunn1313/cargo,tshepang/cargo,rustyhorde/cargo,nipunn1313/cargo,tsurai/cargo,tsurai/cargo,vojtechkral/cargo,tshepang/cargo,eminence/cargo,rust-lang/cargo,eminence/cargo,rust-lang/cargo,tshepang/cargo,nipunn1313/cargo,tsurai/cargo,rustyhorde/cargo,tsurai/cargo,vojtechkral/cargo,tsurai/cargo,vojtechkral/cargo,rust-lang/cargo,rust-lang/cargo,tshepang/cargo,rustyhorde/cargo,nipunn1313/cargo,vojtechkral/cargo,eminence/cargo