[Docs] Update length-tokenfilter.asciidoc (#26849)

Made it clear what the numeric value of `Integer.MAX_VALUE`  is,

docs/reference/analysis/tokenfilters/length-tokenfilter.asciidoc

@@ -11,6 +11,6 @@ type:
 |===========================================================
 |Setting |Description
 |`min` |The minimum number. Defaults to `0`.
-|`max` |The maximum number. Defaults to `Integer.MAX_VALUE`.
+|`max` |The maximum number. Defaults to `Integer.MAX_VALUE`, which is `2^31-1` or 2147483647.
 |===========================================================