Extend the full-text search docs with examples

[gkorland]

Extend the full-text search docs to include examples and descriptions about the different features:

1. Fuzzy matching
2. Prefix matching
3. Tokenization

FalkorDB is using RediSearch as the query engine its query language as its underline query language:
See: https://redis.io/docs/latest/develop/ai/search-and-query/advanced-concepts/query_syntax/

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