chore: fix some comments

Signed-off-by: riyueguang <[email protected]>

Author: riyueguang

Diff for: src/licenses.md

@@ -20,7 +20,7 @@ from.
 - The algorithm or code pattern seems like it was likely copied from somewhere else.
 - When adding new dependencies, double check the dependency's license.
 
-In all of these cases, we will want to check that source to make sure it it is licensed in a way
+In all of these cases, we will want to check that source to make sure it is licensed in a way
 that is compatible with Rust’s license.
 
 Examples

Diff for: src/queries/incremental-compilation-in-detail.md

@@ -529,7 +529,7 @@ session. The overhead of doing so is a few percent of total compilation time.
 
 Data structures used as query results could be factored in a way that removes
 edges from the dependency graph. Especially "span" information is very volatile,
-so including it in query result will increase the chance that that result won't
+so including it in query result will increase the chance that the result won't
 be reusable. See <https://github.com/rust-lang/rust/issues/47389> for more
 information.
 

Diff for: src/ty_module/instantiating_binders.md

@@ -71,7 +71,7 @@ Given these trait implementations `u32: Bar` should _not_ hold. `&'a u32` only i
 - There is a where clause `for<'a> &'^0 T: Trait` on the impl, as we instantiated the early binder with `u32` we actually have to prove `for<'a> &'^0 u32: Trait`
 - We find the `impl<T> Trait for T` impl, we would wind up instantiating the `EarlyBinder` with `&'^0 u32`
 - There is a where clause `for<'a> T: Other<'^0>`, as we instantiated the early binder with `&'^0 u32` we actually have to prove `for<'a> &'^0 u32: Other<'^0>`
-- We find the `impl<'a> Other<'a> for &'a u32` and this impl is enoguh to prove the the bound as the lifetime on the borrow and on the trait are both `'^0`
+- We find the `impl<'a> Other<'a> for &'a u32` and this impl is enoguh to prove the bound as the lifetime on the borrow and on the trait are both `'^0`
 
 This end result is incorrect as we had two separate binders introducing their own generic parameters, the trait bound should have ended up as something like `for<'a1, 'a2> &'^1 u32: Other<'^0>` which is _not_ satisfied by the `impl<'a> Other<'a> for &'a u32`.