fix: Clarify valuecounter aggregator (#5093)

* fix: Clarify valuecounter aggregator

The aggregator only applies to fields and not tags. The current example
use-case explains how to use the aggregator, but the example itself is
suggesting to use the aggreagator on tags that are generated. We got an
issue complaining about this and I'd like to just remove it and instead
clarify fields only.

* Update data/telegraf_plugins.yml

Co-authored-by: Jason Stirnaman <stirnamanj@gmail.com>

* Update data/telegraf_plugins.yml

Co-authored-by: Jason Stirnaman <stirnamanj@gmail.com>

---------

Co-authored-by: Jason Stirnaman <stirnamanj@gmail.com>

data/telegraf_plugins.yml

@@ -2788,14 +2788,11 @@ aggregator:
     id: valuecounter
     description: |
       The ValueCounter aggregator plugin counts the occurrence of values in fields
-      and emits the counter once every 'period' seconds.
+      and emits the count at regular intervals of 'period' seconds.
+      This plugin exclusively operates on fields and doesn't affect tags.
 
-      A use case for the ValueCounter aggregator plugin is when you are processing
-      an HTTP access log with the [Logparser input plugin](#logparser) and want to
-      count the HTTP status codes.
-
-      The fields which will be counted must be configured with the fields configuration directive.
-      When no fields are provided, the plugin will not count any fields.
+      To count specific fields, configure them using the fields configuration directive.
+      If no fields are specified, the plugin won't count any fields.
       The results are emitted in fields, formatted as `originalfieldname_fieldvalue = count`.
 
       ValueCounter only works on fields of the type `int`, `bool`, or `string`.