fix(cursorrules): make system date requirement for documentation only

.cursor/rules/development/development_guide.mdc

@@ -2,7 +2,7 @@
 globs: **/src/**/*
 alwaysApply: false
 ---
-✅ use system date command to timestamp all interactions with accurate date and
+✅ use system date command to timestamp all documentation with accurate date and
   time
 ✅ remove whitespace at the end of lines
 ✅ use npm run lint-fix to check for warnings