Fix typos (#322)

Author: sdwheeler

.markdownlint.yaml

@@ -1,11 +1,11 @@
 MD001: true  # header-increment
-# MD002      # first-header-h1 - Superceded by MD041
+# MD002      # first-header-h1 - Superseded by MD041
 MD003:       # header-style
   style: atx
 MD004:       # ul-style
   style: dash
 MD005: true  # list-indent
-# MD006      # ul-start-left - Superceded by MD007's start_indented option
+# MD006      # ul-start-left - Superseded by MD007
 MD007:       # ul-indent
   indent: 2
   start_indented: false

README.md

@@ -19,7 +19,7 @@ This project has adopted the [Microsoft Open Source Code of Conduct][coc].
 The following list describes the main folders in this repository.
 
 - `.devcontainer` - contains devcontainer settings used by GitHub Codespaces and Visual Studio Code
-  (VS Code) Remote - Containers extension
+  (VS Code) Dev Containers extension
 - `.github` - contains configuration settings used by GitHub for this repository
 - `.vscode` - contains configuration settings and recommended extensions for VS Code
 - `powershell-gallery` - contains the documentation published to