Add documentation of the option into the unstable book

Kobzol · Kobzol · commit a5057b786b1f · 2025-03-31T09:44:41.000+02:00
diff --git a/src/doc/unstable-book/src/compiler-flags/embed-metadata.md b/src/doc/unstable-book/src/compiler-flags/embed-metadata.md
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+## `embed-metadata`
+
+This option instructs `rustc` to include the full metadata in `rlib` and `dylib` crate types. The default value is `yes` (enabled). If disabled (`no`), only stub metadata will be stored in these files, to reduce their size on disk. When using `-Zembed-metadata=no`, you will probably want to use `--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`	+## `embed-metadata`
	`2`	`+`
	`3`	+This option instructs `rustc` to include the full metadata in `rlib` and `dylib` crate types. The default value is `yes` (enabled). If disabled (`no`), only stub metadata will be stored in these files, to reduce their size on disk. When using `-Zembed-metadata=no`, you will probably want to use `--emit=metadata` to produce the full metadata into a separate `.rmeta` file.