Remove references to "lib" argument

Author: willcrichton

src/bin/cargo/commands/doc.rs

@@ -67,7 +67,7 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
             ),
             _ => {
                 return Err(CliError::from(anyhow!(
-                    r#"--scrape-examples must take "all", "examples", or "lib" as an argument"#
+                    r#"--scrape-examples must take "all" or "examples" as an argument"#
                 )));
             }
         }),

src/doc/src/reference/unstable.md

@@ -1392,9 +1392,9 @@ Custom named profiles have been stabilized in the 1.57 release. See the
 
 The `--scrape-examples` argument to the `doc` command tells Rustdoc to search
 crates in the current workspace for calls to functions. Those call-sites are then
-included as documentation. The flag can take an argument of `all`, `lib`, or `examples`
+included as documentation. The flag can take an argument of `all` or `examples`
 which configures which crate in the workspace to analyze for examples. For instance:
 
 ```
-cargo doc --scrape-examples examples -Z unstable-options
+cargo doc -Z unstable-options --scrape-examples examples
 ```