docs: added a full stop for better readbility

[vishu2498]

• Added a "full stop" after "RoleBinding respectively" and before "For further information" to separate both paragraphs since even though they are perfectly written inside "emptymain.go" file but not appearing as desired in the Kubebuilder book (i.e. documentation)
• For better readability and understanding
• Change done inside kubebuilder/docs/book/src/cronjob-tutorial/testdata/emptymain.go

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[vishu2498]

I signed it

[vishu2498]

/assign @camilamacedo86

[camilamacedo86]

Thank you for your contribution. 🥇
/ok-to-test

/lgtm

Checked :

[camilamacedo86]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, Vishwanath-GitHub

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[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-14-1
/test pull-kubebuilder-e2e-k8s-1-16-2

[vishu2498]

Thank you so much!