CBL-7613: Make note internal API on public Log.log (#3476)

* change for consistency - will be used for tests in other platforms that integrate on Swift

Author: velicuvlad

Swift/Log.swift

@@ -53,9 +53,9 @@ public class Log {
 
     init() { }
 
-    // For Unit Tests
-    
-    static func log(domain: LogDomain, level: LogLevel, message: String) {
+    /// Writes a log message to all the enabled log sinks.
+    /// - Note: `Unsupported API` Internal used for testing purpose.
+    public static func log(domain: LogDomain, level: LogLevel, message: String) {
         let cDomain = CBLLogDomain.init(rawValue: UInt(domain.rawValue))
         let cLevel = CBLLogLevel(rawValue: UInt(level.rawValue))!
         CBLDatabase.log().log(to: cDomain, level: cLevel, message: message)