Formalize LinkCompletionTools as public API (#1267)

Author: d-ronnqvist

Sources/SwiftDocC/DocumentationService/Convert/Symbol Link Resolution/LinkCompletionTools.swift

@@ -21,7 +21,6 @@ public import SymbolKit
 /// - Third, determine the minimal unique disambiguation for each completion suggestion using ``suggestedDisambiguation(forCollidingSymbols:)``
 ///
 /// > Tip: You can use ``SymbolInformation/hash(uniqueSymbolID:)`` to compute the hashed symbol identifiers needed for steps 2 and 3 above.
-@_spi(LinkCompletion)  // LinkCompletionTools isn't stable API yet
 public enum LinkCompletionTools {
 
     // MARK: Parsing

Tests/SwiftDocCTests/Infrastructure/Symbol Link Resolution/LinkCompletionToolsTests.swift

@@ -10,7 +10,7 @@
 
 import Foundation
 import XCTest
-@_spi(LinkCompletion) @testable import SwiftDocC
+@testable import SwiftDocC
 
 class LinkCompletionToolsTests: XCTestCase {
     func testParsingLinkStrings() {