replace semicolons with periods

prompts/LLM_PROSE_TELLS.md

@@ -1,7 +1,7 @@
 # LLM Prose Tells
 
 All of these show up in human writing occasionally. No single one is conclusive
-on its own. The difference is concentration; a person might lean on one or two
+on its own. The difference is concentration. A person might lean on one or two
 of these habits across an entire essay, but LLM output will use fifteen of them
 per paragraph, consistently, throughout the entire piece.
 
@@ -9,7 +9,7 @@ per paragraph, consistently, throughout the entire piece.
 
 ## Sentence Structure
 
-### The Em-Dash Pivot: "Not X...but Y"
+### The Em-Dash Pivot: "Not X, but Y"
 
 A negation followed by an em-dash and a reframe.
 
@@ -38,7 +38,7 @@ A short declarative clause, then a colon, then a longer explanation.
 > "The answer is simple: we need to rethink our approach from the ground up."
 
 Models reach for this in every other paragraph. The construction is perfectly
-normal; the frequency gives it away.
+normal. The frequency gives it away.
 
 ### The Triple Construction