Update readme.md

typo

Signed-off-by: CRob <[email protected]>

docs/TTX/readme.md

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-This directory contains files from the OpenSSF's Table Top Exercises (TTX) that demonstrate how to prepare and "roleplay" a cyber seecurity incident.
+This directory contains files from the OpenSSF's Table Top Exercises (TTX) that demonstrate how to prepare and "roleplay" a cyber security incident.
 
 # Cyber Incident Response - Table Top Exercises
 ## Table of Contents