Fix typo in '#658 - WinGet Download.md' Spec File (#4179)

There were miss-placed double quotes in the section titled 'WinGet
Setting - Default Download Output', see commit patches for exact
location of this typo.

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doc/specs/#658 - WinGet Download.md

@@ -97,9 +97,9 @@ usage: winget download [[-q] <query>] [<options>]
 The following items will be included in the WinGet Settings Schema 
 
 ```json
-"DownloadBehavior: {
+"DownloadBehavior": {
         "defaultDownloadDirectory":"%USERPROFILE%/Downloads/"
-}"
+}
 ```
 
 The "defaultDownloadDirectory" setting will be used as the default folder where the package installer and manifest is downloaded to.