Rollup merge of rust-lang#40327 - GuillaumeGomez:macros-urls, r=frewsxcv

Add missing urls in some macros doc

r? @frewsxcv

src/libcore/macros.rs

@@ -32,11 +32,11 @@ macro_rules! panic {
 
 /// Ensure that a boolean expression is `true` at runtime.
 ///
-/// This will invoke the `panic!` macro if the provided expression cannot be
+/// This will invoke the [`panic!`] macro if the provided expression cannot be
 /// evaluated to `true` at runtime.
 ///
 /// Assertions are always checked in both debug and release builds, and cannot
-/// be disabled. See `debug_assert!` for assertions that are not enabled in
+/// be disabled. See [`debug_assert!`] for assertions that are not enabled in
 /// release builds by default.
 ///
 /// Unsafe code relies on `assert!` to enforce run-time invariants that, if
@@ -48,6 +48,8 @@ macro_rules! panic {
 /// This macro has a second version, where a custom panic message can
 /// be provided with or without arguments for formatting.
 ///
+/// [`panic!`]: macro.panic.html
+/// [`debug_assert!`]: macro.debug_assert.html
 /// [testing]: ../book/testing.html
 ///
 /// # Examples
@@ -88,9 +90,11 @@ macro_rules! assert {
 /// On panic, this macro will print the values of the expressions with their
 /// debug representations.
 ///
-/// Like `assert!()`, this macro has a second version, where a custom
+/// Like [`assert!()`], this macro has a second version, where a custom
 /// panic message can be provided.
 ///
+/// [`assert!()`]: macro.assert.html
+///
 /// # Examples
 ///
 /// ```
@@ -134,6 +138,8 @@ macro_rules! assert_eq {
 /// Like `assert!()`, this macro has a second version, where a custom
 /// panic message can be provided.
 ///
+/// [`assert!`]: macro.assert.html
+///
 /// # Examples
 ///
 /// ```
@@ -171,13 +177,13 @@ macro_rules! assert_ne {
 
 /// Ensure that a boolean expression is `true` at runtime.
 ///
-/// This will invoke the `panic!` macro if the provided expression cannot be
+/// This will invoke the [`panic!`] macro if the provided expression cannot be
 /// evaluated to `true` at runtime.
 ///
-/// Like `assert!`, this macro also has a second version, where a custom panic
+/// Like [`assert!`], this macro also has a second version, where a custom panic
 /// message can be provided.
 ///
-/// Unlike `assert!`, `debug_assert!` statements are only enabled in non
+/// Unlike [`assert!`], `debug_assert!` statements are only enabled in non
 /// optimized builds by default. An optimized build will omit all
 /// `debug_assert!` statements unless `-C debug-assertions` is passed to the
 /// compiler. This makes `debug_assert!` useful for checks that are too
@@ -187,10 +193,13 @@ macro_rules! assert_ne {
 /// An unchecked assertion allows a program in an inconsistent state to keep
 /// running, which might have unexpected consequences but does not introduce
 /// unsafety as long as this only happens in safe code. The performance cost
-/// of assertions, is however, not measurable in general. Replacing `assert!`
+/// of assertions, is however, not measurable in general. Replacing [`assert!`]
 /// with `debug_assert!` is thus only encouraged after thorough profiling, and
 /// more importantly, only in safe code!
 ///
+/// [`panic!`]: macro.panic.html
+/// [`assert!`]: macro.assert.html
+///
 /// # Examples
 ///
 /// ```