[JavaScript Debugger] WEB-69992 Add description for registry flags

(cherry picked from commit 481763eb51ea5299542ecf66648f17a1498795a6)

IJ-CR-148095

GitOrigin-RevId: f526a39c6709f1eba4c036549eeb7cb675395fb2

platform/script-debugger/backend/src/debugger/sourcemap/SourceMapDecoder.kt

@@ -190,6 +190,7 @@ private fun parseMap(reader: JsonReaderEx): SourceMapDataImpl? {
     return null
   }
 
+  // https://stackoverflow.com/questions/36228177/jspm-system-js-debugging-with-typescript
   if (Registry.`is`("js.debugger.fix.jspm.source.maps", false) && encodedMappings.startsWith(";") && file != null && file.endsWith(".ts!transpiled")) {
     encodedMappings = encodedMappings.substring(1)
   }