typo proc-marco -> proc-macro (#3472)

Author: NilsIrl

crate_universe/private/crate.bzl

@@ -176,7 +176,7 @@ def _annotation(
         shallow_since (str, optional): An optional timestamp used for crates originating from a git repository
             instead of a crate registry. This flag optimizes fetching the source code.
         override_targets (dict, optional): A dictionary of alternate targets to use when something depends on this crate to allow
-            the parent repo to provide its own version of this dependency. Keys can be `proc-marco`, `custom-build`, `lib`, `bin`.
+            the parent repo to provide its own version of this dependency. Keys can be `proc-macro`, `custom-build`, `lib`, `bin`.
 
     Returns:
         string: A json encoded string containing the specified version and separately all other inputs.