Update docs/docs/00400-tables/00600-performance.md

Co-authored-by: Tyler Cloutier <cloutiertyler@users.noreply.github.com>
Signed-off-by: Jason Larabie <jason@clockworklabs.io>

Author: JasonAtClockwork

docs/docs/00400-tables/00600-performance.md

@@ -12,7 +12,7 @@ Follow these guidelines to optimize table performance in your SpacetimeDB module
 
 ## Use Indexes for Lookups
 
-Always prefer indexed lookups over full table scans:
+Generally prefer indexed lookups over full table scans:
 
 ✅ **Good - Using an index:**