Fix comments

Author: Yui T

src/compiler/emitter.ts

@@ -3258,7 +3258,7 @@ module ts {
                 emitFile(jsFilePath, targetSourceFile);
             }
             else if (!isDeclarationFile(targetSourceFile) && compilerOptions.out) {
-                // Otherwise, if --out is specified and targetSourceFile shouldn't be emitted to own file,
+                // Otherwise, if --out is specified and targetSourceFile is not a declaration file,
                 // Emit all, non-external-module file, into one single output file
                 emitFile(compilerOptions.out);
             }

tests/cases/fourslash/getEmitOutputWithDeclarationFile3.ts

@@ -4,7 +4,6 @@
 // @out: declSingle.js
 
 // @Filename: decl.d.ts
-// @emitThisFile: true
 //// interface I { a: string; }
 
 // @Filename: inputFile2.ts
@@ -17,5 +16,8 @@
 // @Filename: inputFile4.ts
 //// var x1:number = 1000;
 
+// @Filename: inputFile5.js
+//// var x2 = 1000;
+
 debugger;
 verify.baselineGetEmitOutput();