rustc-book: Document `-Z strip=val` option

diff --git a/src/doc/unstable-book/src/compiler-flags/strip.md b/src/doc/unstable-book/src/compiler-flags/strip.md
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+# `strip`
+
+The tracking issue for this feature is: [#72110](https://github.com/rust-lang/rust/issues/72110).
+
+------------------------
+
+Option `-Z strip=val` controls stripping of debuginfo and similar auxiliary data from binaries
+during linking.
+
+Supported values for this option are:
+
+- `none` - debuginfo and symbols (if they exist) are copied to the produced binary or separate files
+depending on the target (e.g. `.pdb` files in case of MSVC).
+- `debuginfo` - debuginfo sections and debuginfo symbols from the symbol table section
+are stripped at link time and are not copied to the produced binary or separate files.
+- `symbols` - same as `debuginfo`, but the rest of the symbol table section is stripped as well
+if the linker supports it.