Fix FormulaAudit/{Checksum,Desc} problems in docs example code

docs/Formula-Cookbook.md

@@ -686,6 +686,7 @@ When parsing a download URL, Homebrew auto-detects the resource type it points t
 ```ruby
 class Foo < Formula
   homepage "https://github.com/some/package"
+  description "Some package"
   url "https://github.com/some/package.git",
       tag:      "v1.6.2",
       revision: "344cd2ee3463abab4c16ac0f9529a846314932a2"
@@ -697,6 +698,7 @@ If not inferable, specify which of Homebrew’s built-in download strategies to
 ```ruby
 class Nginx < Formula
   homepage "https://nginx.org/"
+  description "Some package"
   url "https://nginx.org/download/nginx-1.23.2.tar.gz", using: :homebrew_curl
   sha256 "a80cc272d3d72aaee70aa8b517b4862a635c0256790434dbfc4d618a999b0b46"
   head "https://hg.nginx.org/nginx/", using: :hg
@@ -731,6 +733,7 @@ end
 
 class Foo < Formula
   url "something", using: MyDownloadStrategy
+  description "Some package"
 end
 ```
 

docs/Node-for-Formula-Authors.md

@@ -94,7 +94,7 @@ class Foo < Formula
   desc "Description"
   homepage "..."
   url "https://registry.npmjs.org/foo/-/foo-1.4.2.tgz"
-  sha256 "..."
+  sha256 "abc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1"
 
   depends_on "node"
   # uncomment if there is a native addon inside the dependency tree

docs/Python-for-Formula-Authors.md

@@ -57,7 +57,7 @@ class Foo < Formula
   desc "Bar"
   homepage "https://example.com"
   url "..."
-  sha256 "abc123"
+  sha256 "abc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1"
 
   def install
     virtualenv_install_with_resources
@@ -122,12 +122,18 @@ end
 You can also use the more verbose form and request that specific resources be installed:
 
 ```ruby
-def install
-  venv = virtualenv_create(libexec)
-  %w[six parsedatetime].each do |r|
-    venv.pip_install resource(r)
+class Foo < Formula
+  include Language::Python::Virtualenv
+
+  url "..."
+
+  def install
+    venv = virtualenv_create(libexec)
+    %w[six parsedatetime].each do |r|
+      venv.pip_install resource(r)
+    end
+    venv.pip_install_and_link buildpath
   end
-  venv.pip_install_and_link buildpath
 end
 ```