Remove sentence about Nx 16 still being supported.

[cylewaitforit]

Documentation issue

• Reporting a typo
• Reporting a documentation bug
• Documentation improvement
• Documentation feedback

Is there a specific documentation page you are reporting?

nx/docs/shared/reference/releases.md

Line 34 in b821d29

**\*Note:** v18 is a special release and does not fit into the normal release cycle. Thus, v16 continues to be supported

https://nx.dev/reference/releases#:~:text=Thus%2C%20v16%20continues%20to%20be%20supported%20according%20to%20schedule.

Additional context or description

The releases page contains the sentence “Thus, v16 continues to be supported according to schedule.” which can be removed because v16 is not supported.