Merge pull request #1245 from nihaals/improve-ga-doc

Improved Google Analytics example

Author: ehuss

book-example/src/format/config.md

@@ -260,7 +260,7 @@ preferred-dark-theme = "navy"
 curly-quotes = true
 mathjax-support = false
 copy-fonts = true
-google-analytics = "123456"
+google-analytics = "UA-123456-7"
 additional-css = ["custom.css", "custom2.css"]
 additional-js = ["custom.js"]
 no-section-label = false