Remove trailing space and reformat link

In response to feedback from Ian Lance Taylor

Author: ExtraE113

src/plugin/plugin.go

@@ -30,8 +30,8 @@
 //     portable.
 //
 //   - Plugins are poorly supported by the Go race detector. Even simple
-//     race conditions may not be automatically detected. See 
-//     [this issue](https://github.com/golang/go/issues/24245) for more information.
+//     race conditions may not be automatically detected. See
+//     https://go.dev/issue/24245 for more information.
 //
 //   - Applications that use plugins may require careful configuration
 //     to ensure that the various parts of the program be made available