📖 : Document update - Fix document spelling mistake

[pratikmota]

Fixes #3323
Motivation:

• Need to improve kubebuilder documentation for community
• remove spelling mistake and typo errors ( book-v3 branch)

Changes:
1] 6.4. Testing your own plugins
https://book.kubebuilder.io/plugins/testing-plugins.html
Simiply --> Simply
dimenstion --> dimension
Cleanup environment --> Clean up the environment

2] 6.1.3.1. kustomize/v1
https://book.kubebuilder.io/plugins/kustomize-v1.html
laguage --> language

3] 6.1.3.2. kustomize/v2-alpha
https://book.kubebuilder.io/plugins/kustomize-v2-alpha.html
plataform -> platform

4] 4.2.1. go/v3 vs go/v4-alpha
https://book.kubebuilder.io/migration/v3vsv4.html
customise --> customize

5] 3. Tutorial: Component Config
https://book.kubebuilder.io/component-config-tutorial/tutorial.html
with the a component --> with the component

6] 3.1. Changing things up
https://book.kubebuilder.io/component-config-tutorial/api-changes.html
exising project --> existing project

7] 3.3.1. Adding a new Config Type
https://book.kubebuilder.io/component-config-tutorial/config-type.html
explicity --> explicitly

[k8s-ci-robot]

Hi @pratikmota. Thanks for your PR.

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[camilamacedo86]

Thank you for the contribution 🥇

/lgtm
/approved

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, pratikmota

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[camilamacedo86]

/ok-to-test