Address review: fix warning message format and add NU1704 to TOC

Author: sbomer

docs/TOC.md

@@ -202,6 +202,7 @@
 ### [NU1701](reference/errors-and-warnings/NU1701.md)
 ### [NU1702](reference/errors-and-warnings/NU1702.md)
 ### [NU1703](reference/errors-and-warnings/NU1703.md)
+### [NU1704](reference/errors-and-warnings/NU1704.md)
 ### [NU1900](reference/errors-and-warnings/NU1900.md)
 ### [NU1901](reference/errors-and-warnings/NU1901-NU1904.md)
 ### [NU1902](reference/errors-and-warnings/NU1901-NU1904.md)

docs/reference/errors-and-warnings/NU1704.md

@@ -10,7 +10,7 @@ f1_keywords:
 
 # NuGet Warning NU1704
 
-> Package 'packageId' version uses the deprecated MonoAndroid framework instead of 'net6.0-android' or later. Consider upgrading to a newer version of this package or contacting the package author.
+> Package 'packageId' 'version' uses the deprecated MonoAndroid framework instead of 'net6.0-android' or later. Consider upgrading to a newer version of this package or contacting the package author.
 
 ### Issue