Help: Document that VS 2017 compile features are recorded

They were recorded by commit v3.7.0-rc1~156^2~2 (Features: Record
features for VS 15 Preview 4, 2016-09-05).

Fixes: #16974

Help/manual/cmake-compile-features.7.rst

@@ -334,7 +334,7 @@ versions specified for each:
 * ``AppleClang``: Apple Clang for Xcode versions 4.4 though 6.2.
 * ``Clang``: Clang compiler versions 2.9 through 3.4.
 * ``GNU``: GNU compiler versions 4.4 through 5.0.
-* ``MSVC``: Microsoft Visual Studio versions 2010 through 2015.
+* ``MSVC``: Microsoft Visual Studio versions 2010 through 2017.
 * ``SunPro``: Oracle SolarisStudio versions 12.4 through 12.5.
 * ``Intel``: Intel compiler versions 12.1 through 17.0.