RangefuncExperiment: fix Markdown link

Change-Id: I6a09b746437955c72cd0707f4b9b15b1d762e429
GitHub-Last-Rev: c7c6da3
GitHub-Pull-Request: #53
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/672535
Reviewed-by: Sean Liao <[email protected]>

Author: jub0bs

RangefuncExperiment.md

@@ -107,7 +107,7 @@ limit.
 
 Another reason to stop at two is to have a more limited number of
 function signatures for general code to define.
-Today the (iter)[/pkg/iter] package can easily define names for
+Today the [iter](/pkg/iter) package can easily define names for
 iterators:
 
 	package iter