fix(diagnostics): fix arg list using the diagnostic node rather than the source node for missing-export-doc

Author: NathanSnail

script/core/diagnostics/helper/missing-doc-helper.lua

@@ -48,7 +48,7 @@ local function checkFunctionNamed(functionName, source, diagnosticRangeSource, b
                                   paramId, returnId)
     diagnosticRangeSource = diagnosticRangeSource or source
     bindDocsSource = bindDocsSource or source
-    local argCount = diagnosticRangeSource.args and #diagnosticRangeSource.args or 0
+    local argCount = source.args and #source.args or 0
 
     if argCount == 0 and not source.returns and not bindDocsSource.bindDocs then
         callback {

test/diagnostics/missing-export-doc.lua

@@ -70,7 +70,7 @@ end
 TEST [[
 local M = {}
 
-function <!M:f1()!> end
+function <!M:f1!>() end
 
 ---comment
 function M:f2()