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docs(search): Add example search for finding tables without the name field (#7647)

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Co-authored-by: Indy Prentice <indy@Indys-MacBook-Pro.local>
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docs/how/search.md
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@ -122,10 +122,14 @@ If you want to:
- ```/q editedDescription: *logical* OR description: *logical*``` [Sample results](https://demo.datahubproject.io/search?page=1&query=%2Fq%20editedDescription%3A%20%2Alogical%2A%20OR%20description%3A%20%2Alogical%2A)
- Similar to field descriptions, dataset descriptions can be found in 2 aspects, hence the need to search 2 attributes.
- Find a dataset which reside in one of the browsing folders, for instance, the **hive** folder
- Find a dataset which resides in one of the browsing folders, for instance, the **hive** folder
- ```/q browsePaths: *hive*``` [Sample results](https://demo.datahubproject.io/search?page=1&query=%2Fq%20browsePaths%3A%20%2Ahive%2A)
- BrowsePath is stored as a complete string, for instance ```/datasets/prod/hive/SampleKafkaDataset```, hence the need for wildcards on both ends of the term to return a result.
- Find a dataset without the **name** field
- ```/q -_exists_:name``` [Sample results](https://demo.datahubproject.io/search?filter_entity___false___EQUAL___0=DATASET&page=1&query=%252Fq%2520-_exists_%253Aname&unionType=0)
- the `-` is negating the existence of the field name.
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## Additional Resources