Auto merge of #96094 - Elliot-Roberts:fix_doctests, r=compiler-errors

Begin fixing all the broken doctests in `compiler/`

Begins to fix #95994.
All of them pass now but 24 of them I've marked with `ignore HELP (<explanation>)` (asking for help) as I'm unsure how to get them to work / if we should leave them as they are.
There are also a few that I marked `ignore` that could maybe be made to work but seem less important.
Each `ignore` has a rough "reason" for ignoring after it parentheses, with

- `(pseudo-rust)` meaning "mostly rust-like but contains foreign syntax"
- `(illustrative)` a somewhat catchall for either a fragment of rust that doesn't stand on its own (like a lone type), or abbreviated rust with ellipses and undeclared types that would get too cluttered if made compile-worthy.
- `(not-rust)` stuff that isn't rust but benefits from the syntax highlighting, like MIR.
- `(internal)` uses `rustc_*` code which would be difficult to make work with the testing setup.

Those reason notes are a bit inconsistently applied and messy though. If that's important I can go through them again and try a more principled approach. When I run `rg '```ignore \(' .` on the repo, there look to be lots of different conventions other people have used for this sort of thing. I could try unifying them all if that would be helpful.

I'm not sure if there was a better existing way to do this but I wrote my own script to help me run all the doctests and wade through the output. If that would be useful to anyone else, I put it here: https://github.com/Elliot-Roberts/rust_doctest_fixing_tool

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -394,15 +394,15 @@ impl Drop for Linker<'_> {
 ///
 /// At a high level Thin LTO looks like:
 ///
-///     1. Prepare a "summary" of each LLVM module in question which describes
-///        the values inside, cost of the values, etc.
-///     2. Merge the summaries of all modules in question into one "index"
-///     3. Perform some global analysis on this index
-///     4. For each module, use the index and analysis calculated previously to
-///        perform local transformations on the module, for example inlining
-///        small functions from other modules.
-///     5. Run thin-specific optimization passes over each module, and then code
-///        generate everything at the end.
+///    1. Prepare a "summary" of each LLVM module in question which describes
+///       the values inside, cost of the values, etc.
+///    2. Merge the summaries of all modules in question into one "index"
+///    3. Perform some global analysis on this index
+///    4. For each module, use the index and analysis calculated previously to
+///       perform local transformations on the module, for example inlining
+///       small functions from other modules.
+///    5. Run thin-specific optimization passes over each module, and then code
+///       generate everything at the end.
 ///
 /// The summary for each module is intended to be quite cheap, and the global
 /// index is relatively quite cheap to create as well. As a result, the goal of