docs(data): change 'enableChangeTracking' reference to `noChangeTrack…

[donohoea]

…ing`

change 'enableChangeTracking' reference to noChangeTracking and invert flag from 'false' to 'true'

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Current documentation references 'enableChangeTracking' as the metadata required to disable change tracking on a collection. This does not work as the current code base is looking for the 'noChangeTracking' flag.

What is the new behavior?

Updates documentation to reference 'noChangeTacking' and inverts the flag from false to true to match new context.

Does this PR introduce a breaking change?

[ ] Yes
[x ] No

Other information

[ngrxbot]

Preview docs changes for 10f68e0 at https://previews.ngrx.io/pr2463-10f68e0/

[timdeschryver]

Thanks @donohoea !