Use the placement: 'line' property in the street-labels example

This makes the code of the example much simpler.

examples/street-labels.html

@@ -3,14 +3,8 @@ layout: example.html
 title: Street Labels
 shortdesc: Render street names with a custom render.
 docs: >
-  Example showing the use of a custom renderer to render text along a path. [Labelgun](https://github.com/Geovation/labelgun) is used to avoid label collisions. [label-segment](https://github.com/ahocevar/label-segment) makes sure that labels are placed on suitable street segments. [textpath](https://github.com/ahocevar/textpath) arranges the letters of a label along the geometry.
-tags: "vector, label, collision detection, labelgun, linelabel"
-resources:
-  - https://cdn.polyfill.io/v2/polyfill.min.js?features=Set
-  - https://unpkg.com/rbush@2.0.1/rbush.min.js
-  - https://unpkg.com/labelgun@0.1.1/lib/labelgun.min.js
-  - https://unpkg.com/textpath@1.0.1/dist/textpath.js
-  - https://unpkg.com/label-segment@1.0.0/dist/label-segment.js
+  Example showing the use of a text style with `placement: 'line'` to render text along a path.
+tags: "vector, label, streets"
 cloak:
   As1HiMj1PvLPlqc_gtM7AqZfBL8ZL3VrjaS3zIb22Uvb9WKhuJObROC-qUpa81U5: Your Bing Maps Key from http://www.bingmapsportal.com/ here
 ---