Auto merge of #10708 - svenstaro:patch-1, r=weihanglo
Document how to debug change detection events
### What does this PR try to resolve?
I noticed that my build would sometimes seemingly randomly rebuild other crates. I figured this must be the build script detecting a change in some external files. In order to debug this, I figured I'd look at the Cargo sources whether something like this was already being logged. Thankfully, the logging for this was already in place but I didn't find it documented anyway so I thought it might be rather helpful in such scenarios.
I believe it's a common enough scenario that inclusion into the official documentation on this topic should be considered.
projects / cargo.git / commit