Fix borked links

Author: marxin

src/appendix/code-index.md

@@ -27,7 +27,7 @@ Item            |  Kind    | Short description           | Chapter            |
 `StringReader` | struct | This is the lexer used during parsing. It consumes characters from the raw source code being compiled and produces a series of tokens for use by the rest of the parser | [The parser] |  [compiler/rustc_parse/src/lexer/mod.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/lexer/struct.StringReader.html)
 `rustc_ast::token_stream::TokenStream` | struct | An abstract sequence of tokens, organized into `TokenTree`s | [The parser], [Macro expansion] | [compiler/rustc_ast/src/tokenstream.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/tokenstream/struct.TokenStream.html)
 `TraitDef` | struct | This struct contains a trait's definition with type information | [The `ty` modules] |  [compiler/rustc_middle/src/ty/trait_def.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/trait_def/struct.TraitDef.html)
-`TraitRef` | struct | The combination of a trait and its input types (e.g. `P0: Trait<P1...Pn>`) | [Trait Solving: Goals and Clauses]  |  [compiler/rustc_middle/src/ty/sty.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TraitRef.html)
+`TraitRef` | struct | The combination of a trait and its input types (e.g. `P0: Trait<P1...Pn>`) | [Trait Solving: Goals and Clauses]  |  [compiler/rustc_middle/src/ty/sty.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/type.TraitRef.html)
 `Ty<'tcx>` | struct | This is the internal representation of a type used for type checking | [Type checking] | [compiler/rustc_middle/src/ty/mod.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.Ty.html)
 `TyCtxt<'tcx>` | struct | The "typing context". This is the central data structure in the compiler. It is the context that you use to perform all manner of queries | [The `ty` modules] | [compiler/rustc_middle/src/ty/context.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TyCtxt.html)
 

src/backend/implicit-caller-location.md

@@ -64,7 +64,7 @@ reach the first function call in the stack which does *not* have the attribute.
 
 Starting at the bottom, we iterate up over stack [`Frame`][const-frame]s in the
 [`InterpCx::stack`][const-stack], calling
-[`InstanceDef::requires_caller_location`][requires-location] on the
+[`InstanceKind::requires_caller_location`][requires-location] on the
 [`Instance`s from each `Frame`][frame-instance]. We stop once we find one that returns `false` and
 return the span of the *previous* frame which was the "topmost" tracked function.
 
@@ -166,7 +166,7 @@ function:
 * is not `#[naked]`
 
 If the use is valid, we set [`CodegenFnAttrsFlags::TRACK_CALLER`][attrs-flags]. This flag influences
-the return value of [`InstanceDef::requires_caller_location`][requires-location] which is in turn
+the return value of [`InstanceKind::requires_caller_location`][requires-location] which is in turn
 used in both const and codegen contexts to ensure correct propagation.
 
 ### Traits
@@ -267,10 +267,10 @@ to the author and reviewers.
 [rationale]: https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md#rationale
 [revised design]: https://github.com/rust-lang/rust/issues/47809#issuecomment-443538059
 [attrs-flags]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/middle/codegen_fn_attrs/struct.CodegenFnAttrFlags.html#associatedconstant.TRACK_CALLER
-[`ReifyShim`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/enum.InstanceDef.html#variant.ReifyShim
+[`ReifyShim`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/enum.InstanceKind.html#variant.ReifyShim
 [`Location`]: https://doc.rust-lang.org/core/panic/struct.Location.html
 [const-find-closest]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_const_eval/interpret/struct.InterpCx.html#method.find_closest_untracked_caller_location
-[requires-location]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/enum.InstanceDef.html#method.requires_caller_location
+[requires-location]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/instance/enum.InstanceKind.html#method.requires_caller_location
 [alloc-location]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_const_eval/interpret/struct.InterpCx.html#method.alloc_caller_location
 [fcx-location]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_ssa/mir/struct.FunctionCx.html#structfield.caller_location
 [const-location-query]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TyCtxt.html#method.const_caller_location

src/solve/opaque-types.md

@@ -41,7 +41,7 @@ discarding their inferred types at the end, changing the behavior of an opaque t
 multiple times during coherence: [example][coherence-example]
 
 Inside of the defining scope we start by checking whether the type and const arguments of the
-opaque are all placeholders: [source](placeholder-ck). If this check is ambiguous,
+opaque are all placeholders: [source][placeholder-ck]. If this check is ambiguous,
 return ambiguity, if it fails, return `Err(NoSolution)`. This check ignores regions which are
 only checked at the end of borrowck. If it succeeds, continue.