[Docs] Fix explanation for `from` and `size` example (#28320)

docs/reference/getting-started.asciidoc

@@ -858,7 +858,7 @@ GET /bank/_search
 
 Note that if `size` is not specified, it defaults to 10.
 
-This example does a `match_all` and returns documents 11 through 20:
+This example does a `match_all` and returns documents 10 through 19:
 
 [source,js]
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