8383792: Simplify internal DocFinder API

[hns]

Please review a change to simplify use of the internal DocFinder class. Previously, users of the class had to call the search or find method when looking up documentation in an overridden method, depending on whether an explicit orverridden source method was provided.

The find method is updated to handle both cases (which are always used together, but passing null for the src argument restores the old behavior of the find method). Additionally, find is renamed to searchInherited to make its relation the search method clearer (searchInherited searches in overridden methods only while search starts in the method itself).

The internal search0 method loses a redundant boolean parameter, the new overriddenMethodsOnly parameter is the same as not(includeMethodInSearch) and throwExceptionIfDoesNotOverride.

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Issue

• JDK-8383792: Simplify internal DocFinder API (Task - P4)

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