Fix Example Applications

[keetonian]

Description:

Many example applications have incorrect components. If you find any example application that has an incorrect template, README, code, or just needs to be updated, please comment with what's wrong and link to the example below.

If you find a broken example and know how to fix it, please submit a PR!

[keetonian]

kinesis-process-record
https://github.com/awslabs/serverless-application-model/tree/master/examples/apps/kinesis-process-record

Remove irrelevant policy templates, verify code works, fix README to refer to this app (and not a slack app).

[keetonian]

kinesis-firehose-syslog-to-json
https://github.com/awslabs/serverless-application-model/tree/master/examples/apps/kinesis-firehose-syslog-to-json

Remove policy templates, verify code works, update README to be relevant.

[keetonian]

kinesis-firehose-process-record
https://github.com/awslabs/serverless-application-model/tree/master/examples/apps/kinesis-firehose-process-record

Remove policy templates, verify code, update README.

[keetonian]

These were removed in #1341

They can be found in a new repository: https://github.com/aws-samples/serverless-app-examples