update original

rustbook-en/src/ch08-01-vectors.md

@@ -202,7 +202,7 @@ some of the columns in the row contain integers, some floating-point numbers,
 and some strings. We can define an enum whose variants will hold the different
 value types, and all the enum variants will be considered the same type: that
 of the enum. Then we can create a vector to hold that enum and so, ultimately,
-holds different types. We’ve demonstrated this in Listing 8-9.
+hold different types. We’ve demonstrated this in Listing 8-9.
 
 ```rust
 {{#rustdoc_include ../listings/ch08-common-collections/listing-08-09/src/main.rs:here}}

rustbook-en/src/ch12-05-working-with-environment-variables.md

@@ -113,7 +113,7 @@ function, as shown in Listing 12-22. This still won’t compile yet.
 Finally, we need to check for the environment variable. The functions for
 working with environment variables are in the `env` module in the standard
 library, so we bring that module into scope at the top of *src/lib.rs*. Then
-we’ll use the `var` function from the `env` module to check to see if any value
+we’ll use the `var` function from the `env` module to check if any value
 has been set for an environment variable named `IGNORE_CASE`, as shown in
 Listing 12-23.