Suggestion: add possible solution for too few topics in FAQ

Nobody has claimed this yet.

After having the problem of only very few (two) topics from some of my admittedly small data sets, I found that some of them had multiple short, duplicate and uninformative documents.

For example, when fitting to a set of survey responses, documents such as "Don't know", "Nothing to say", "No comment" appeared numerous times in the corpus - and generated one of two topics. Removing these duplicate and uninformative documents led to the generation of 11 topics instead of just two, on a corpus of <500 documents, using the default nr_topics="auto" parameter.

I think it would be helpful to add this (removal of recurrent, uninformative documents) as a possible solution to the FAQ under ["I have only a few topics, how do I increase them?"](https://maartengr.github.io/BERTopic/faq.html#i-have-only-a-few-topics-how-do-i-increase-them)

Open the FAQ at faq.html and find “I have only a few topics, how do I increase them?”. Read the surrounding guidance, then add recurrent, uninformative documents as a possible solution using the examples from this issue; done when the suggestion appears clearly in that FAQ section.

Written by the indexing model from the issue text.