Remove confusing reference to branch name

[jsoref]

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Description

Some auth0 repositories use master as the default branch, e.g.:

• auth0/lock
• auth0/Lock.swift

Others use main, e.g.:

• auth0/Lock.Android
• auth0/auth0-cli

Mentioning master in a generic template that's shared between both kinds of repositories results in some pretty confusing messaging.

Afaict, the text is trying to mean the default branch, so instead of writing master, this PR changes the prose to match the intention.

Testing

I've looked at the wording.

• [ ] This change adds test coverage for new/changed/fixed functionality

Checklist

• [ ] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [ ] All active GitHub checks for tests, formatting, and security are passing
• [ ] The correct base branch is being used, if not master