Softens "maximum" for items

Relates to: gitlab-org/gitlab-design#870 (moved)

Why is this change being made?

"Spend company money like its your own" isn't compatible with "maximum" - so we should soften the language to reflect there's a need for a conversation if you're going over a threshold.

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what