[DOCS] Fix edge n-gram tokenizer nav

Adds a missing float tag to the edge n-gram tokenizer docs. This tag
ensures the edge n-gram tokenizer docs display on the same page.

Author: jrodewig

docs/reference/analysis/tokenizers/edgengram-tokenizer.asciidoc

@@ -99,6 +99,7 @@ Character classes may be any of the following:
 * `punctuation` -- for example `!` or `"`
 * `symbol` --      for example `$` or `√`
 
+[float]
 [[max-gram-limits]]
 === Limitations of the `max_gram` parameter