Doctests: Fix all complexity lint docs

cc #4319

clippy_lints/src/utils/author.rs

@@ -15,7 +15,7 @@ declare_clippy_lint! {
     /// **What it does:** Generates clippy code that detects the offending pattern
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// // ./tests/ui/my_lint.rs
     /// fn foo() {
     ///     // detect the following pattern
@@ -24,13 +24,14 @@ declare_clippy_lint! {
     ///         // but ignore everything from here on
     ///         #![clippy::author = "ignore"]
     ///     }
+    ///     ()
     /// }
     /// ```
     ///
     /// Running `TESTNAME=ui/my_lint cargo uitest` will produce
     /// a `./tests/ui/new_lint.stdout` file with the generated code:
     ///
-    /// ```rust
+    /// ```rust,ignore
     /// // ./tests/ui/new_lint.stdout
     /// if_chain! {
     ///     if let ExprKind::If(ref cond, ref then, None) = item.node,

clippy_lints/src/utils/inspector.rs

@@ -13,14 +13,14 @@ declare_clippy_lint! {
     /// attribute
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// #[clippy::dump]
     /// extern crate foo;
     /// ```
     ///
     /// prints
     ///
-    /// ```
+    /// ```text
     /// item `foo`
     /// visibility inherited from outer item
     /// extern crate dylib source: "/path/to/foo.so"

clippy_lints/src/utils/internal_lints.rs

@@ -38,7 +38,7 @@ declare_clippy_lint! {
     /// `declare_lint_pass!`, `impl_lint_pass!`, and `lint_array!` macros.
     ///
     /// **Example:**
-    /// ```rust
+    /// ```rust,ignore
     /// declare_lint! { pub LINT_1, ... }
     /// declare_lint! { pub LINT_2, ... }
     /// declare_lint! { pub FORGOTTEN_LINT, ... }
@@ -62,12 +62,12 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// Bad:
-    /// ```rust
+    /// ```rust,ignore
     /// cx.span_lint(LINT_NAME, "message");
     /// ```
     ///
     /// Good:
-    /// ```rust
+    /// ```rust,ignore
     /// utils::span_lint(cx, LINT_NAME, "message");
     /// ```
     pub COMPILER_LINT_FUNCTIONS,
@@ -85,12 +85,12 @@ declare_clippy_lint! {
     ///
     /// **Example:**
     /// Bad:
-    /// ```rust
+    /// ```rust,ignore
     /// expr.span.ctxt().outer().expn_info()
     /// ```
     ///
     /// Good:
-    /// ```rust
+    /// ```rust,ignore
     /// expr.span.ctxt().outer_expn_info()
     /// ```
     pub OUTER_EXPN_EXPN_INFO,