Change incorrect "--no-basepath" flag to "--no-base-path" in the developer documentation

[andrzejgulak]

Kibana version: 7.9.1

Original install method (e.g. download page, yum, from source, etc.): source

Describe the bug:
Upon trying to start with yarn start --no-basepath as per documentation I'm greeted with an error:

ERROR Extra serve options "--no-basepath" must have a value

Steps to reproduce:

1. clone repo & checkout v7.9.1
2. yarn kbn bootstrap
3. yarn start --no-basepath

Expected behavior:
Start's kibana in dev mode without a random app prefix as per documentation

Provide logs and/or server output (if relevant):

ERROR Extra serve options "--no-basepath" must have a value

Any additional context:
Using node 10.22.0
Tried running with:

yarn start --no-basepath=true

only to be greeted with:

log [13:58:24.918] [fatal][root] { Error: Unknown configuration key(s): "no-basepath". Check for spelling errors and ensure that expected plugins are installed.
at ensureValidConfiguration (private/kibana/src/core/server/legacy/config/ensure_valid_configuration.ts:41:11) code: 'InvalidConfig', processExitCode: 64, cause: undefined }

FATAL Error: Unknown configuration key(s): "no-basepath". Check for spelling errors and ensure that expected plugins are installed.

error Command failed with exit code 64.

[elasticmachine]

Pinging @elastic/kibana-platform (Team:Platform)

[azasypkin]

Hey @andrzejgulak ,

Thanks for reporting, it seems to be a typo in our dev docs, the correct option is --no-base-path. Can you please try that?

I re-titled and tagged this issue to fix this documentation typo.