docs(core): fix broken link to awslint (aws#9398)

Fixes aws#9394

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

CONTRIBUTING.md

@@ -364,7 +364,7 @@ part of the build of all AWS modules in the project and enforces the [AWS
 Construct Library Design Guidelines](./DESIGN_GUIDELINES.md).
 
 For more information about this tool, see the [awslint
-README](./tools/awslint/README.md).
+README](./packages/awslint/README.md).
 
 Generally speaking, if you make any changes which violate an awslint rule, build
 will fail with appropriate messages. All rules are documented and explained in
@@ -377,7 +377,7 @@ Here are a few useful commands:
  * `scripts/foreach.sh yarn awslint` will start linting the entire repo, progressively. Rerun `scripts/foreach.sh` after fixing to continue.
  * `lerna run awslint --no-bail --stream 2> awslint.txt` will run __awslint__ in all modules and collect all results into awslint.txt
  * `lerna run awslint -- -i <RULE>` will run awslint throughout the repo and
-   evaluate only the rule specified [awslint README](./tools/awslint/README.md)
+   evaluate only the rule specified [awslint README](./packages/awslint/README.md)
    for details on include/exclude rule patterns.
 
 ### cfn2ts