Add new reminder in "Magnify with shortcut" page

Add new reminder string in "Magnify with shortcut" page when
it's under gesture navigation mode.

Reference link of screenshot:
https://drive.google.com/file/d/1uo31FZebhXKcCR8QY_WrgEPiInzARmIl/view?usp=sharing

Bug: 134645913
Test: Visual
Change-Id: Ibbaa162d4acf0fdeed8c98b2aa1d83953880e6a6
Merged-In: Ibbaa162d4acf0fdeed8c98b2aa1d83953880e6a6