Update docs on Context.Done(), Context.Deadline() and Context.Err() (#2196)
Update docs on Context.Done(), Context.Deadline() and Context.Err() (#2196)

Co-authored-by: Bo-Yi Wu <f80eec1bf98b3feebacc247f35f2b506218004cb@gmail.com>

thinkerou/gin,gin-gonic/gin