Update docs on RestTemplate to indicate it's superceded by WebClient [SPR-16993]

[spring-projects-issues]

Rossen Stoyanchev opened SPR-16993 and commented

The Javadoc of the RestTemplate and the documentation should suggest more explicitly that WebClient supercedes the RestTemplate, that it will not have new features, and may be deprecated at some point in the future.

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Affects: 5.0.7

Issue Links:

• RestTemplate should support streaming download and upload [SPR-16885] #21424 RestTemplate should support streaming download and upload

Referenced from: commits 91d17cf, aa656c4, 5f96d7c