tests: fix some typos in comment

Signed-off-by: tcpdumppy <847462026@qq.com>

tests/ui/lint/dead-code/allow-or-expect-dead_code-114557-2.rs

@@ -1,10 +1,10 @@
 //@ check-pass
 
-// this test checks that the `dead_code` lint is *NOT* being emited
+// this test checks that the `dead_code` lint is *NOT* being emitted
 // for `foo` as `foo` is being used by `main`, and so the `#[expect]`
 // is unfulfilled
 //
-// it also checks that the `dead_code` lint is also *NOT* emited
+// it also checks that the `dead_code` lint is also *NOT* emitted
 // for `bar` as it's suppresed by the `#[expect]` on `bar`
 
 #![warn(dead_code)] // to override compiletest

tests/ui/lint/dead-code/allow-or-expect-dead_code-114557-3.rs

@@ -1,7 +1,7 @@
 //@ check-pass
 
 // this test makes sure that the `unfulfilled_lint_expectations` lint
-// is being emited for `foo` as foo is not dead code, it's pub
+// is being emitted for `foo` as foo is not dead code, it's pub
 
 #![warn(dead_code)] // to override compiletest
 

tests/ui/lint/dead-code/allow-or-expect-dead_code-114557.rs

@@ -2,7 +2,7 @@
 //@ revisions: allow expect
 
 // this test checks that no matter if we put #[allow(dead_code)]
-// or #[expect(dead_code)], no warning is being emited
+// or #[expect(dead_code)], no warning is being emitted
 
 #![warn(dead_code)] // to override compiletest
 

tests/ui/lint/unused/must-use-ops.rs

@@ -6,7 +6,7 @@
 #![feature(never_type)]
 
 fn deref_never(x: &!) {
-    // Don't lint for uninhabited typess
+    // Don't lint for uninhabited types
     *x;
 }
 

tests/ui/privacy/pub-priv-dep/priv-dep-issue-122756.rs

@@ -5,7 +5,7 @@
 #![deny(exported_private_dependencies)]
 
 // Ensure the libbar.rlib is loaded first. If the command line parameter `--extern foo` does not
-// exist, previus version would fail to compile
+// exist, previous version would fail to compile
 #![crate_type = "rlib"]
 extern crate bar;
 extern crate foo;