Documentation feedback on /docs/overview.rst: Educate about FLOAT_VECTOR

[amotl]

Documentation feedback

• Page title: Features Overview
• Page URL: https://cratedb.com/docs/sqlalchemy-cratedb/overview.html
• Source: https://github.com/crate/sqlalchemy-cratedb/blob/main/docs/overview.rst

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This page covers many features of the CrateDB dialect for SQLAlchemy on a single page. It is massive, but nice.
What is missing yet, is to whip up this page by adding a good example how to apply the vector data type FLOAT_VECTOR.
Currently, it is just educated about on the page about data types.