fix LocaleMatcher API doc issues

Description

I noticed some copy-paste bugs in the C++ LocaleMatcher API docs.
For example, class Builder has @see LocaleMatcher#builder() but that exists only in Java.
And build() says @return new LocaleMatcher. but that's a bit misleading in C++ where it returns a matcher by value.
There might be more.

Assignee

Markus Scherer

Reporter

Markus Scherer

Components

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Reviewer

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Priority

medium

Time Needed

Minutes

Fix versions

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