ceil() and floor() description is imprecise

Quoting documentation:

ceil
Round the value up to the nearest greater integer.

floor
Round the value down to the nearest smaller integer.

Instead of strict "greater" and "smaller" descriptions should use weak "greater or equal"/"not less" and "smaller or equal"/"not greater" respectively.

References:

• https://en.wikipedia.org/wiki/Floor_and_ceiling_functions
• https://en.cppreference.com/w/c/numeric/math/ceil
• https://en.cppreference.com/w/c/numeric/math/floor