[docs] Reword terms flagged by PoliCheck

[jonathanpeppers]

After merging Java.Interop into this repo, its docs are now scanned under dotnet/android's PoliCheck rules for the first time, which surfaced three flagged terms. These are prose-only hits, so rewording is the cleanest fix (it's also the outcome PoliCheck itself recommends for "blacklist") and avoids adding suppression signatures for documentation text.

Changes:

• external/Java.Interop/Documentation/Architecture.md: "ball of mud" -> "tangled mess"
• external/Java.Interop/Documentation/EnumMappingFile.md: "blacklists" -> "block lists"

This clears all three active PoliCheck results (both blacklist/blacklists hits were on the same line).

[Copilot]

Pull request overview

Updates Java.Interop documentation wording to address terms flagged by dotnet/android’s PoliCheck rules after the merge, keeping the changes prose-only to avoid suppression signatures.

Changes:

• Reword “ball of mud” → “tangled mess” in Java.Interop architecture documentation.
• Reword “blacklists” → “block lists” in enum mapping format documentation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
external/Java.Interop/Documentation/EnumMappingFile.md	Rewords a flagged term in the enum mapping format discussion.
external/Java.Interop/Documentation/Architecture.md	Rewords a flagged phrase in the architecture critique section.