fix a couple of ftrivial typos (NFC).

Author: matthiaskrgr

clippy_dev/src/lib.rs

@@ -432,7 +432,7 @@ fn test_gen_deprecated() {
             "should_assert_eq",
             "group1",
             "abc",
-            Some("has been superseeded by should_assert_eq2"),
+            Some("has been superseded by should_assert_eq2"),
             "module_name",
         ),
         Lint::new(
@@ -447,7 +447,7 @@ fn test_gen_deprecated() {
     let expected: Vec<String> = vec![
         "    store.register_removed(",
         "        \"should_assert_eq\",",
-        "        \"has been superseeded by should_assert_eq2\",",
+        "        \"has been superseded by should_assert_eq2\",",
         "    );",
         "    store.register_removed(",
         "        \"another_deprecated\",",

clippy_lints/src/double_comparison.rs

@@ -17,7 +17,7 @@ use crate::syntax::source_map::Span;
 
 use crate::utils::{snippet_with_applicability, span_lint_and_sugg, SpanlessEq};
 
-/// **What it does:** Checks for double comparions that could be simpified to a single expression.
+/// **What it does:** Checks for double comparions that could be simplified to a single expression.
 ///
 ///
 /// **Why is this bad?** Readability.

clippy_lints/src/write.rs

@@ -257,7 +257,7 @@ impl EarlyLintPass for Pass {
 }
 
 /// Checks the arguments of `print[ln]!` and `write[ln]!` calls. It will return a tuple of two
-/// options. The first part of the tuple is `format_str` of the macros. The secund part of the tuple
+/// options. The first part of the tuple is `format_str` of the macros. The second part of the tuple
 /// is in the `write[ln]!` case the expression the `format_str` should be written to.
 ///
 /// Example: