Very minor text edits

[h-m-f-t]

• In Building with Loosely-Coupled Parts, the words "magic bullet" bring to mind an image of a blender. Consider "silver bullet" or "magic button".
• In the Fund Systems, Not Monoliths checklist, the phrase "they're not for e.g. setting up a database or maintaining servers" read awkwardly ("for, for example"). Consider revising, or eliminating the "for" (the next clause in the sentence appears to take this form).

Happy to PR if this looks ok.

This document is excellent, thank you for writing it. 🇺🇸