Update some docs that are not changelogs

Author: kulp

README.md

@@ -20,7 +20,7 @@ void eleven_out_of_ten_majestic_af(Doggo* pupper);
 functions and use its types:
 
 ```rust
-/* automatically generated by rust-bindgen */
+/* automatically generated by rust-bindgen 0.99.9 */
 
 #[repr(C)]
 pub struct Doggo {
@@ -71,4 +71,4 @@ For more details on how `bindgen` uses `libclang`, see the [`bindgen` users guid
 
 [bindgen-cmdline]: https://rust-lang.github.io/rust-bindgen/command-line-usage.html
 [clang-sys-env]: https://github.com/KyleMayes/clang-sys#environment-variables
-[bindgen-book-clang]: https://rust-lang.github.io/rust-bindgen/requirements.html#clang
+[bindgen-book-clang]: https://rust-lang.github.io/rust-bindgen/requirements.html#clang

book/src/introduction.md

@@ -18,7 +18,7 @@ void cool_function(int i, char c, CoolStruct* cs);
 functions and use its types:
 
 ```rust
-/* automatically generated by rust-bindgen */
+/* automatically generated by rust-bindgen 0.99.9 */
 
 #[repr(C)]
 pub struct CoolStruct {