Update buildpack-group.md

Add links to builder & meta-buildpack description.

Signed-off-by: Daniel Mikusa <[email protected]>

Author: Daniel Mikusa

content/docs/concepts/components/buildpack-group.md

@@ -10,7 +10,7 @@ summary="A buildpack group is a list of specific buildpacks composed together in
 
 For example, you might have a buildpack that installs Java and a buildpack that uses Maven to build your application. These two buildpacks can be combined into a group to implement higher-level functionality, specifically that the first one will install Java and the second will use Java to run Maven, which is a Java build tool.
 
-Because you can have many buildpack groups in a builder or meta-buildpack and you can reuse buildpacks, you could have a second buidlpack group that reuses the buildpack to provide Java but uses a third buildpack that provides Gradle to build your application. By doing this, you can create additional high-level functionality without having duplication.
+Because you can have many buildpack groups in a [builder][builder] or [meta-buildpack][meta-buildpack] and you can reuse buildpacks, you could have a second buidlpack group that reuses the buildpack to provide Java but uses a third buildpack that provides Gradle to build your application. By doing this, you can create additional high-level functionality without having duplication.
 
 ## Anatomy of a buildpack group
 
@@ -20,7 +20,7 @@ A buildpack entry is identified by an id and a version. It may also be marked as
 
 ## Detection with buildpack groups
 
-A builder or meta-buildpack may contain multiple buildpack groups. When the lifecycle executes the detection process, it will process each buildpack group it finds in the order that the groups are specified. For each buildpack group, the lifecycle will execute the detect phase of all buildpacks in that group (these can be executed in parallel) and aggregate the results. The lifecycle will select the first builpack group by order where all of the non-optional buildpacks in that group pass detection.
+A [builder][builder] or [meta-buildpack][meta-buildpack] may contain multiple buildpack groups. When the lifecycle executes the detection process, it will process each buildpack group it finds in the order that the groups are specified. For each buildpack group, the lifecycle will execute the detect phase of all buildpacks in that group (these can be executed in parallel) and aggregate the results. The lifecycle will select the first builpack group by order where all of the non-optional buildpacks in that group pass detection.
 
 For example, if a builder has buildpack groups A, B and C. The lifecycle will run detection against A. If all of the non-optional buildpacks in that group pass detection, then it will select A. In that case, B and C will not be processed. If A has any failing non-optional buildpacks, then the lifecycle will move on to process buildpack group B. If B has any failing non-optional buildpacks, then the lifecycle will move on to process buildpack group C. If C fails, then the entire detection process will fail.
 
@@ -51,3 +51,5 @@ The [Operator's Guide][operator-guide] has more information on creating builders
 [buildpack-group]: /docs/reference/config/builder-config/#order-_list-required_
 [order-resolution]: https://github.com/buildpacks/spec/blob/main/buildpack.md#order-resolution
 [operator-guide]: /docs/operator-guide/
+[builder]: /docs/concepts/components/builder/
+[meta-buildpack]: /docs/concepts/components/buildpack/#meta-buildpack