[Docs] Fix wrong math in overview.asciidoc (#37209)

docs/reference/rollup/overview.asciidoc

@@ -6,7 +6,7 @@
 experimental[]
 
 Time-based data (documents that are predominantly identified by their timestamp) often have associated retention policies
-to manage data growth.  For example, your system may be generating 500,000 documents every second.  That will generate
+to manage data growth.  For example, your system may be generating 500 documents every second.  That will generate
 43 million documents per day, and nearly 16 billion documents a year.
 
 While your analysts and data scientists may wish you stored that data indefinitely for analysis, time is never-ending and