Update description for self-contained and -no-self-contained options

Author: meaghanlewis

docs/core/tools/dotnet-build.md

@@ -113,7 +113,7 @@ Running `dotnet build` is equivalent to running `dotnet msbuild -restore`; howev
 
 - **`--no-self-contained`**
 
-  Publishes the application as a framework dependent application. A compatible .NET runtime must be installed on the target machine to run the application. Available since .NET 6 SDK.
+  Equivalent to `--self-contained false`.
 
 - **`-o|--output <OUTPUT_DIRECTORY>`**
 
@@ -140,7 +140,7 @@ Running `dotnet build` is equivalent to running `dotnet msbuild -restore`; howev
 
 - **`--sc|--self-contained`**
 
-  Publishes the .NET runtime with the application so the runtime doesn't need to be installed on the target machine. The default is `false`. However, when targeting .NET 7 or lower, the default is `true` if a runtime identifier is specified. Available since .NET 6 SDK.
+  Publish the .NET runtime with your application so the runtime doesn't need to be installed on the target machine. The default is `true`.
 
 - **`--source <SOURCE>`**
 

docs/core/tools/dotnet-publish.md

@@ -182,7 +182,7 @@ For more information, see the following resources:
 
 - **`--sc|--self-contained`**
 
-  Publishes the .NET runtime with the application so the runtime doesn't need to be installed on the target machine. The default is `false`. However, when targeting .NET 7 or lower, the default is `true` if a runtime identifier is specified. Available since .NET 6 SDK.
+  Publish the .NET runtime with your application so the runtime doesn't need to be installed on the target machine. The default is `true`.
 
 - **`--no-self-contained`**