Update doc wildcard_dependencies (#13810)

Currently
https://rust-lang.github.io/rust-clippy/master/index.html#wildcard_dependencies
doc doesn't contain explanation how it should be so added more details

----

changelog: none

Author: llogiq

clippy_lints/src/cargo/mod.rs

@@ -161,6 +161,15 @@ declare_clippy_lint! {
     /// [dependencies]
     /// regex = "*"
     /// ```
+    /// Use instead:
+    /// ```toml
+    /// [dependencies]
+    /// # allow patch updates, but not minor or major version changes
+    /// some_crate_1 = "~1.2.3"
+    ///
+    /// # pin the version to a specific version
+    /// some_crate_2 = "=1.2.3"
+    /// ```
     #[clippy::version = "1.32.0"]
     pub WILDCARD_DEPENDENCIES,
     cargo,