restructure first paragraph

prompts/LLM_PROSE_TELLS.md

@@ -1,8 +1,8 @@
 # LLM Prose Tells
 
-Every pattern in this document shows up in human writing occasionally. They
+Human writers occasionally use every pattern in this document. The reason they
-become diagnostic only through density. A person might use one or two across an
+work as tells is that LLM output packs fifteen of them into a single paragraph
-entire essay, but LLM output packs fifteen into a single paragraph.
+where a human would use one or two across an entire essay.
 
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