chore: add geolocation databases license caption (open-telemetry#37141)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

The use and/or administration of geolocation databases might involve
compiling with vendors licensing, this PR adds some words into the
`geoIP` processor as a reminder.

<!-- Issue number (e.g. open-telemetry#1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes

<!--Describe what testing was performed and which tests were added.-->
#### Testing

<!--Describe the documentation added.-->
#### Documentation

<!--Please delete paragraphs that you did not use before submitting.-->

Author: rogercoll

processor/geoipprocessor/internal/provider/maxmindprovider/README.md

@@ -1,5 +1,7 @@
 # MaxMind GeoIP Provider
 
+> Use of MaxMind and other geolocation databases are subject to applicable licenses and terms governing the databases. Consult the database provider for the latest applicable terms.
+
 This package provides a MaxMind GeoIP provider for use with the OpenTelemetry GeoIP processor. It leverages the [geoip2-golang package](https://github.com/oschwald/geoip2-golang) to query geographical information associated with IP addresses from MaxMind databases. See recommended clients: https://dev.maxmind.com/geoip/docs/databases#api-clients
 
 # Features