Unify casing for boolean true in targets (#9006)

I copy/pasted a sample usage of WriteOnlyWhenDifferent--the one with
the casing `True`, which sparked a discussion over what
MSBuild style should be. It should be lowercase.

eng/BootStrapMSBuild.targets

@@ -33,16 +33,16 @@
   <Target Name="GatherNuGetDependencies" AfterTargets="ResolvePackageAssets">
     <ItemGroup>
         <!-- Collect known NuGet dependencies after resolving packages -->
-        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('NuGet.'))' == 'True'" />
-        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('Newtonsoft.Json'))' == 'True'" />
-        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('NuGetSdkResolver'))' == 'True'" />
-        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('Microsoft.Extensions.'))' == 'True'" />
+        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('NuGet.'))' == 'true'" />
+        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('Newtonsoft.Json'))' == 'true'" />
+        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('NuGetSdkResolver'))' == 'true'" />
+        <_NuGetRuntimeDependencies Include="%(RuntimeCopyLocalItems.Identity)" Condition="'@(RuntimeCopyLocalItems->Contains('Microsoft.Extensions.'))' == 'true'" />
 
         <!-- NuGet.targets and NuGet.RestoreEx.targets will be in the RuntimeTargetsCopyLocalItems ItemGroup -->
-        <_NuGetRuntimeDependencies Include="%(RuntimeTargetsCopyLocalItems.Identity)" Condition="'@(RuntimeTargetsCopyLocalItems->Contains('NuGet.'))' == 'True'" />
+        <_NuGetRuntimeDependencies Include="%(RuntimeTargetsCopyLocalItems.Identity)" Condition="'@(RuntimeTargetsCopyLocalItems->Contains('NuGet.'))' == 'true'" />
 
         <!-- NuGet.Build.Tasks.Console.exe will be in the None ItemGroup -->
-        <_NuGetRuntimeDependencies Include="%(None.Identity)" Condition="'@(None->Contains('NuGet.'))' == 'True'" />
+        <_NuGetRuntimeDependencies Include="%(None.Identity)" Condition="'@(None->Contains('NuGet.'))' == 'true'" />
 
         <_NuGetRuntimeDependencies Include="$(DOTNET_INSTALL_DIR)\sdk\$(DotNetCliVersion)\RuntimeIdentifierGraph.json" />
     </ItemGroup>
@@ -56,11 +56,11 @@
          need to be in a specific location that does not mesh with NuGet. To resolve this, we include the default
          PackageReference assets but will remove them from the Reference ItemGroup before RAR runs and avoid the warnings -->
     <ItemGroup>
-        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Microsoft.Build'))' == 'True'" />
-        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('NuGet.'))' == 'True'" />
-        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Newtonsoft.Json'))' == 'True'" />
-        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('NuGetSdkResolver'))' == 'True'" />
-        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Microsoft.Extensions.'))' == 'True'" />
+        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Microsoft.Build'))' == 'true'" />
+        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('NuGet.'))' == 'true'" />
+        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Newtonsoft.Json'))' == 'true'" />
+        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('NuGetSdkResolver'))' == 'true'" />
+        <Reference Remove="%(Reference.Identity)" Condition="'@(Reference->Contains('Microsoft.Extensions.'))' == 'true'" />
     </ItemGroup>
   </Target>
 

src/Tasks/Microsoft.Common.CurrentVersion.targets

@@ -1,4 +1,4 @@
-<!--
+<!--
 ***********************************************************************************************
 Microsoft.Common.CurrentVersion.targets
 
@@ -1187,7 +1187,7 @@ Copyright (C) Microsoft Corporation. All rights reserved.
 
     <!-- Create the directories for intermediate and final build products, and any other arbitrary directories. -->
     <!-- We are going to continue on error here so that if the tree is read only we will still get intellisense -->
-    <MakeDir Directories="$(OutDir);$(IntermediateOutputPath);@(DocFileItem->'%(RelativeDir)');@(CreateDirectory)" ContinueOnError="True"/>
+    <MakeDir Directories="$(OutDir);$(IntermediateOutputPath);@(DocFileItem->'%(RelativeDir)');@(CreateDirectory)" ContinueOnError="true"/>
 
   </Target>
 
@@ -3737,7 +3737,7 @@ Copyright (C) Microsoft Corporation. All rights reserved.
       <Output TaskParameter="HashResult" PropertyName="CoreCompileDependencyHash" />
     </Hash>
 
-    <WriteLinesToFile Lines="$(CoreCompileDependencyHash)" File="$(IntermediateOutputPath)$(MSBuildProjectFile).CoreCompileInputs.cache" Overwrite="True" WriteOnlyWhenDifferent="True" />
+    <WriteLinesToFile Lines="$(CoreCompileDependencyHash)" File="$(IntermediateOutputPath)$(MSBuildProjectFile).CoreCompileInputs.cache" Overwrite="true" WriteOnlyWhenDifferent="true" />
 
     <ItemGroup>
       <FileWrites Include="$(IntermediateOutputPath)$(MSBuildProjectFile).CoreCompileInputs.cache" />