[Website]: self-conflicting paragraph about type families

### Before you submit

- [x] This issue is about a documentation page, flow, or piece of content.

### Type of issue

None

### What documentation page or section is affected

https://www.elastic.co/docs/reference/elasticsearch/mapping-reference/field-data-types

### What happened?

This paragraph is contradicting itself:

"Currently, there are **two type families**, **keyword** and **text**. Other type families have only a single field type. For example, the **boolean type family** consists of one field type: boolean."

If it is true that "keyword", "text", and "boolean" are type families, then it cannot be true that "there are two type families".

Perhaps this would be clearer:

"Currently, only two type families contain multiple field types: keyword and text. All other field types each form their own single-member family. For example, the boolean type family consists of one field type: boolean."

### Additional info

_No response_