docs: improve language in std-traits section (#2872)

Co-authored-by: Dmitri Gribenko <gribozavr@gmail.com>

Author: mgeisler

src/std-traits.md

@@ -4,7 +4,7 @@
 
 <details>
 
-As with the standard-library types, spend time reviewing the documentation for
+As with the standard library types, spend time reviewing the documentation for
 each trait.
 
 This section is long. Take a break midway through.

src/std-traits/operators.md

@@ -44,10 +44,10 @@ Discussion points:
 - You could implement `Add` for two different types, e.g.
   `impl Add<(i32, i32)> for Point` would add a tuple to a `Point`.
 
-The `Not` trait (`!` operator) is notable because it does not "boolify" like the
-same operator in C-family languages; instead, for integer types it negates each
-bit of the number, which arithmetically is equivalent to subtracting it from -1:
-`!5 == -6`.
+The `Not` trait (`!` operator) is notable because it does not convert the
+argument to `bool` like the same operator in C-family languages; instead, for
+integer types it flips each bit of the number, which, arithmetically, is
+equivalent to subtracting the argument from `-1`: `!5 == -6`.
 
 </details>