Remove - from the beginning of the xml comment (#13797)

Author: marcin-krystianc

src/FSharp.Build/Microsoft.FSharp.NetSdk.props

@@ -30,7 +30,7 @@ WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and
   </Choose>
 
   <PropertyGroup>
-    <EnableDefaultCompileItems Condition=" '$(EnableDefaultCompileItems)' == '' ">false</EnableDefaultCompileItems>                                <!--- Do not glob F# source files -->
+    <EnableDefaultCompileItems Condition=" '$(EnableDefaultCompileItems)' == '' ">false</EnableDefaultCompileItems>                                <!-- Do not glob F# source files -->
     <EnableDefaultNoneItems Condition=" '$(EnableDefaultNoneItems)' == '' ">false</EnableDefaultNoneItems>
   </PropertyGroup>
 

src/FSharp.Build/Microsoft.FSharp.Targets

@@ -88,7 +88,7 @@ this file.
     </PropertyGroup>
 
     <PropertyGroup>
-      <!--- So that the UI can display default values for these properties, specify values when not set -->
+      <!-- So that the UI can display default values for these properties, specify values when not set -->
       <FSharpPreferNetFrameworkTools Condition="'$(FSharpPreferNetFrameworkTools)'!='true'">false</FSharpPreferNetFrameworkTools>
       <FSharpPrefer64BitTools Condition="'$(FSharpPrefer64BitTools)'!='false'">true</FSharpPrefer64BitTools>
     </PropertyGroup>