clean up the text that warns users that their device time is wrong when syncing

[kjozwiak]

Description

We'll need to clean up the following text before this warning makes it out from nightly --> dev. It's currently in 0.65.

You can find the current text in the following example:

brave/brave-core#2155 (comment)

We should get this done sooner than later as this resolves a common support issues where users are receiving errors due to their times being wrong.

Steps to Reproduce

1. Sync: proper message on wrong device time #3962

Actual result:

Example of current text: brave/brave-core#2155 (comment)

Expected result:

We'll need text from @bradleyrichter's team.

Reproduces how often:

100% reproducible using the STR mentioned above.

Brave version (brave://version info)

Brave	0.65.17 Chromium: 74.0.3729.40 (Official Build) nightly(64-bit)
Revision	278d6a0d856d8314f36fb9a68b6e1d85cd0d14e7-refs/branch-heads/3729@{#470}
OS	Mac OS X

Reproducible on current release:

N/A

• Does it reproduce on brave-browser dev/beta builds? N/A. Change is currently only in the nightly build.

Website problems only:

• Does the issue resolve itself when disabling Brave Shields? N/A
• Is the issue reproducible on the latest version of Chrome? N/A

Additional Information

CCing @bradleyrichter @rebron @AlexeyBarabash

[rebron]

Close. Text review is in the pr.