Add documentation of the option into the unstable book

Kobzol · Kobzol · commit 5f8c3d73edb4 · 2025-03-14T11:22:48.000+01:00
diff --git a/src/doc/unstable-book/src/compiler-flags/split_metadata.md b/src/doc/unstable-book/src/compiler-flags/split_metadata.md
@@ -0,0 +1,3 @@
+## `split-metadata`
+
+This option instructs `rustc` to only include a stub metadata section in `rlib` and `dylib` crate types instead of full metadata, to reduce their size on disk. You will probably want to combine this option with `--emit=metadata` to produce the full metadata into a separate `.rmeta` file.

Original file line number	Diff line number	Diff line change
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	`1`	+## `split-metadata`
	`2`	`+`
	`3`	+This option instructs `rustc` to only include a stub metadata section in `rlib` and `dylib` crate types instead of full metadata, to reduce their size on disk. You will probably want to combine this option with `--emit=metadata` to produce the full metadata into a separate `.rmeta` file.