chore: fix some typos

Signed-off-by: peicuiping <ezc5@sina.cn>

tests/rustdoc-ui/doctest/non-local-defs-impl.rs

@@ -21,7 +21,7 @@
 /// }
 /// ```
 ///
-/// But this shoudln't produce a warning:
+/// But this shouldn't produce a warning:
 /// ```rust,no_run
 /// # extern crate pub_trait;
 /// # use pub_trait::Trait;

tests/ui/closures/2229_closure_analysis/issue-118144.rs

@@ -6,7 +6,7 @@ fn func(func_arg: &mut V) {
     || {
         // Declaring `x` separately instead of using
         // a destructuring binding like `let V(x) = ...`
-        // becaue only `V(x) = ...` triggers the ICE
+        // because only `V(x) = ...` triggers the ICE
         let x;
         V(x) = func_arg; //~ ERROR: mismatched types
         func_arg.0 = 0;

tests/ui/coroutine/issue-53548.rs

@@ -6,7 +6,7 @@
 // to process this `'r` region bound. In particular, to be WF, the
 // region bound must meet the requirements of the trait, and hence we
 // got `for<'r> { 'r: 'static }`. This would ICE because the `Binder`
-// constructor we were using was assering that no higher-ranked
+// constructor we were using was asserting that no higher-ranked
 // regions were involved (because the WF code is supposed to skip
 // those). The error (if debug-asserions were disabled) came because
 // we obviously cannot prove that `'r: 'static` for any region `'r`.

tests/ui/panics/default-backtrace-ice.rs

@@ -17,7 +17,7 @@
 // `__rust_{begin,end}_short_backtrace` markers, which only appear in full
 // backtraces. The rest of the backtrace is filtered out.
 //
-// Ignored on msvc becaue the `__rust_{begin,end}_short_backtrace` symbols
+// Ignored on msvc because the `__rust_{begin,end}_short_backtrace` symbols
 // aren't reliable.
 
 fn main() { missing_ident; }