Trying to invoke the hello function locally for template aws-node-http-api fails using documentation

[mcam10]

Following the documentation on the template above.. the local invocation of the function fails. The function name is API not Hello.

Just need to update the documentation to reflect the correct function name.

[medikoo]

@mcam10 PR with a fix to the documentation is welcome!

[mcam10]

This will be addressed in this PR
#765