clean up in CONTRIBUTING and README

Author: etpinard

CONTRIBUTING.md

@@ -94,12 +94,12 @@ To view the results of a run on CircleCI, download the `build/test_images/` and
 ### Repo organization
 
 - Distributed files are in `dist/`
-- Sources files are in `src/`, including the index. 
-- Build and repo management scripts are in `./tasks/`
+- Sources files are in `src/`, including the index
+- Build and repo management scripts are in `tasks/`
 - All tasks can be run using [`npm run-srcript`](https://docs.npmjs.com/cli/run-script)
 - Tests are `test/`, they are partitioned into `image` and `jasmine` tests
 - Test dashboard and image viewer code is in `devtools/`
-- Non-distributed, git-ignored built files are in `build/` 
+- Non-distributed, git-ignored built files are in `build/`
 
 
 ### Coding style

README.md

@@ -44,7 +44,7 @@ Read the [Getting started page](https://plot.ly/javascript/getting-started/) for
 
 ## Bugs and feature requests
 
-Have a bug or a feature request? Please first read the [issues guidelines](https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md).
+Have a bug or a feature request? Please first read the [issues guidelines](https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md#opening-issues).
 
 ## Documentation