Fix Javadoc error in ProtobufDecoder

[ZaMan0806]

This pull request fixes a Javadoc error in ProtobufDecoder.MessageSizeReader.readMessageSize(), where the @return tag is followed by a redundant return.

Motivation

The @return tag already renders as "Returns:" in the generated documentation, so the extra word is duplicated in the published API docs:

Returns:
return the message size, or null if the data in the input buffer was insufficient

The MessageSizeReader interface was introduced in 7.0, so this has not appeared in a released version of the reference Javadoc yet.

Modifications

• Removed the redundant return from the @return tag in MessageSizeReader.readMessageSize(DataBuffer).

No behavior change intended — this is a documentation-only change.

Verification

Built the Javadoc locally and confirmed the rendered output in
spring-web/build/docs/javadoc/org/springframework/http/codec/protobuf/ProtobufDecoder.MessageSizeReader.html
before and after the change.

[sbrannen]

The MessageSizeReader interface was introduced in 7.0, so this has not appeared in a released version of the reference Javadoc yet.

I'm not sure why you claim that. We have released 7.0.0 through 7.0.8.

Please check facts before making such statements.

[github-actions]

Fixed via 1600e24

[sbrannen]

This has been merged into 7.0.x and main.

Thanks

---

For future reference, there is no need to supply such verbose details to explain that there's an extra "return" word in the Javadoc.