Documentation polishing.

Author: eric-s-raymond

README.md

@@ -30,7 +30,7 @@ Diffs are configured with Unified (or ContextDiff) structures, and can
 be output to an io.Writer or returned as a string.
 
 ```Go
-diff := difflib.UnifiedDiff{
+diff := difflib.LineDiffParams{
     A:        difflib.SplitLines("foo\nbar\n"),
     B:        difflib.SplitLines("foo\nbaz\n"),
     FromFile: "Original",