Remove mentions of legacy "Navigator" in "Performace Overview"

[sebastiancarlos]

Description

On the "Performance Overview" page, there are several mentions of "Navigator", which was an early navigation solution provided in the core library.

Consider replacing them with "a navigator", to suggest one of the many available solutions today.

There is also a mention of "NavigatorIOS", which is also deprecated.

Documentation version

next, and likely earlier

[github-actions]

👋 Hey there, it looks like there has been no activity on this issue in the last 90 days. Has the issue been fixed, or does it still require the community attention? This issue will be closed in the next 7 days if no further activity occurs. Thank you for your contributions.

[sebastiancarlos]

It hasn't been fixed

[github-actions]

👋 Hey there, it looks like there has been no activity on this issue in the last 90 days. Has the issue been fixed, or does it still require the community attention? This issue will be closed in the next 7 days if no further activity occurs. Thank you for your contributions.