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docs: clarify description of uri/uriprefix (#16110) 

* docs: clarify description of uri/uripath

* Apply suggestions from code review

Co-authored-by: Charles Smith <techdocsmith@gmail.com>

---------

Co-authored-by: Charles Smith <techdocsmith@gmail.com>
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docs/development/extensions-core/lookups-cached-global.md
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@ -211,8 +211,8 @@ The remapping values for each globally cached lookup can be specified by a JSON
|Property|Description|Required|Default|
|--------|-----------|--------|-------|
|`pollPeriod`|Period between polling for updates|No|0 (only once)|
|`uri`|URI for the file of interest, specified as a file, hdfs, s3 or gs path|No|Use `uriPrefix`|
|`uriPrefix`|A URI that specifies a directory (or other searchable resource) in which to search for files|No|Use `uri`|
|`uri`|URI for the lookup file. Can be a file, HDFS, S3 or GCS path|Either `uri` or `uriPrefix` must be set|None|
|`uriPrefix`|A URI prefix that specifies a directory or other searchable resource where lookup files are located |Either `uri` or `uriPrefix` must be set|None|
|`fileRegex`|Optional regex for matching the file name under `uriPrefix`. Only used if `uriPrefix` is used|No|`".*"`|
|`namespaceParseSpec`|How to interpret the data at the URI|Yes||
|`maxHeapPercentage`|The maximum percentage of heap size that the lookup should consume. If the lookup grows beyond this size, warning messages will be logged in the respective service logs.|No|10% of JVM heap size|