content: remove irrelevant bug documentation

The aforementioned bug has been resolved in https://golang.org/cl/183991.
Removing it from the blog content reduces cognitive overhead for readers.

Change-Id: I19b944599d97895217e3178b31edf6a25c4c1fdc
GitHub-Last-Rev: b7ec545
GitHub-Pull-Request: #48
Reviewed-on: https://go-review.googlesource.com/c/blog/+/277612
Reviewed-by: Bryan C. Mills <[email protected]>

Author: supermarin

content/using-go-modules.article

@@ -422,7 +422,7 @@ been removed, renamed, or otherwise changed in incompatible ways.
 Reading the docs, we can see that `Hello` has become `HelloV3`:
 
 	$ go doc rsc.io/quote/v3
-	package quote // import "rsc.io/quote"
+	package quote // import "rsc.io/quote/v3"
 
 	Package quote collects pithy sayings.
 
@@ -433,10 +433,6 @@ Reading the docs, we can see that `Hello` has become `HelloV3`:
 	func OptV3() string
 	$
 
-(There is also a
-[known bug](https://golang.org/issue/30778) in the output;
-the displayed import path has incorrectly dropped the `/v3`.)
-
 We can update our use of `quote.Hello()` in `hello.go` to use `quoteV3.HelloV3()`:
 
 	package hello