internal/lsp/diff: fix sources listed for diff implementation

Change-Id: I36b2903f4938c4e7a3f15567e11ab31f3f7d78f7
Reviewed-on: https://go-review.googlesource.com/c/160840
Reviewed-by: Ian Cottrell <iancottrell@google.com>
diff --git a/internal/lsp/diff/diff.go b/internal/lsp/diff/diff.go
index 3c09483..dc6da2f 100644
--- a/internal/lsp/diff/diff.go
+++ b/internal/lsp/diff/diff.go
@@ -8,7 +8,7 @@
 import "strings"
 
 // Sources:
-// https://blog.jcoglan.com/2017/02/15/the-myers-diff-algorithm-part-3/
+// https://blog.jcoglan.com/2017/02/17/the-myers-diff-algorithm-part-3/
 // https://www.codeproject.com/Articles/42279/%2FArticles%2F42279%2FInvestigating-Myers-diff-algorithm-Part-1-of-2
 
 type Op struct {