bug#43543: 28.0.50; Supress truncate notice in eldoc

[Yuan Fu]

I limited the number of lines for eldoc to 2, but now instead of showing 2 
lines of information, eldoc only shows 1 lines of information and one line for 
""\n(Documentation truncated. Use `%s' to see rest)”” I understand the 
necessity of this notice, but it is so annoying for eldoc to use half of its 
precious screen space to display this unnecessary (for me) information.

Could there be an option to turn off this notice?

Yuan