Rollup merge of rust-lang#59930 - kornelski:first-robots, r=GuillaumeGomez

Exclude some copies of old book editions from search engines

These are only stubs that confuse search engine users. There's no useful content in these locations.

Author: Centril

src/doc/robots.txt

@@ -17,3 +17,11 @@ Disallow: /1.0.0-beta.2/
 Disallow: /1.0.0-beta.3/
 Disallow: /1.0.0-beta.4/
 Disallow: /1.0.0-beta.5/
+Disallow: /book/first-edition/
+Disallow: /book/second-edition/
+Disallow: /stable/book/first-edition/
+Disallow: /stable/book/second-edition/
+Disallow: /beta/book/first-edition/
+Disallow: /beta/book/second-edition/
+Disallow: /nightly/book/first-edition/
+Disallow: /nightly/book/second-edition/