Add missing links

Author: m-allanson

examples/using-remark/src/pages/2017-11-14---excerpts/index.md

@@ -22,7 +22,7 @@ tags:
 }
 ```
 
-You can also manually mark in your markdown where to stop excerpting—similar to Jekyl. `gatsby-transformer-remark` uses [gray-matter]() to parse markdown frontmatter, so you can specify an excerpt_separator, as well as any of the other options mentioned [here](), in the `gatsby-config.js` file.
+You can also manually mark in your markdown where to stop excerpting—similar to Jekyl. `gatsby-transformer-remark` uses [gray-matter](https://github.com/jonschlinkert/gray-matter) to parse markdown frontmatter, so you can specify an `excerpt_separator`, as well as any of the other options mentioned [here](https://github.com/jonschlinkert/gray-matter#options), in the `gatsby-config.js` file.
 
 ```json
 {
@@ -33,6 +33,6 @@ You can also manually mark in your markdown where to stop excerpting—similar t
 }
 ```
 
-Any file that does not have the given excerpt_separator will fall back to the default pruning method.
+Any file that does not have the given `excerpt_separator` will fall back to the default pruning method.
 
 You can see the results [here](/excerpt-example)

examples/using-remark/src/pages/examples/example---custom-separator/index.md

@@ -7,9 +7,8 @@ author: Daisy Buchanan
 
 This example uses a custom excerpt_separator.
 
-You can manually mark in your markdown where to stop excerpting—similar to Jekyl. `gatsby-transformer-remark` uses [gray-matter]() to parse markdown frontmatter, so you can specify an excerpt_separator, as well as any of the other options mentioned [here](), in the `gatsby-config.js` file.
+You can manually mark in your markdown where to stop excerpting—similar to Jekyll. <!-- end -->`gatsby-transformer-remark` uses [gray-matter](https://github.com/jonschlinkert/gray-matter) to parse markdown frontmatter, so you can specify an `excerpt_separator`, as well as any of the other options mentioned [here](https://github.com/jonschlinkert/gray-matter#options), in the `gatsby-config.js` file.
 
-<!-- end -->
 
 ```json
 {
@@ -20,4 +19,4 @@ You can manually mark in your markdown where to stop excerpting—similar to Jek
 }
 ```
 
-Any file that does not have the given excerpt_separator will fall back to the default pruning method.
+Any file that does not have the given `excerpt_separator` will fall back to the default pruning method.