Documentation issue description

Update the links to remove unnecessary words.

• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/index.rst
• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/playbooks.rst
• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/release_notes.rst
• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/requirements_managed.rst
• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/requirements-single.rst
• https://github.com/ansible-collections/ibm_zos_core/blob/main/docs/source/filters.rst

Update any URLs with the embedded master to main

Ansible version

NA

IBM z/OS Ansible core Version

v1.4.0-beta.1

Ansible module

No response