clarify paragraph in "On using std::sync::Mutex and tokio::sync::Mutex"
#836
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The way that this paragraph is written right now it makes it seem that
tokio::sync::Mutex::lockwill block the executor even if the function isasync.As clarified here, this is not the case and the intention of the paragraph is to mention, instead, that this kind of mutex isn't more performant.
Personally, this paragraph has confused me on this behavior in the past. I'm not sure if the wording I used is the best to capture the original intention but I'd like if it can be updated.
Thanks!