Auto merge of rust-lang#14145 - ehuss:config-summary, r=Muscraft

Docs: Update config summary to include missing keys.

The summary at the top of the config chapter is intended to include all of the config keys to provide an overview of all the different options available. A few keys were missing, so this adds those missing keys.

Author: bors

src/doc/src/reference/config.md

@@ -76,6 +76,10 @@ rustdocflags = ["…", "…"]     # custom flags to pass to rustdoc
 incremental = true            # whether or not to enable incremental compilation
 dep-info-basedir = "…"        # path for the base directory for targets in depfiles
 
+[credential-alias]
+# Provides a way to define aliases for credential providers.
+my-alias = ["/usr/bin/cargo-credential-example", "--argument", "value", "--flag"]
+
 [doc]
 browser = "chromium"          # browser to use with `cargo doc --open`,
                               # overrides the `BROWSER` environment variable
@@ -142,10 +146,16 @@ rpath = false            # Sets the rpath linking option.
 [registries.<name>]  # registries other than crates.io
 index = "…"          # URL of the registry index
 token = "…"          # authentication token for the registry
+credential-provider = "cargo:token" # The credential provider for this registry.
+
+[registries.crates-io]
+protocol = "sparse"  # The protocol to use to access crates.io.
 
 [registry]
 default = "…"        # name of the default registry
 token = "…"          # authentication token for crates.io
+credential-provider = "cargo:token"           # The credential provider for crates.io.
+global-credential-providers = ["cargo:token"] # The credential providers to use by default.
 
 [source.<name>]      # source definition and replacement
 replace-with = "…"   # replace this source with the given named source
@@ -1001,7 +1011,7 @@ See [Registry Authentication](registry-authentication.md) for more information.
 
 #### `registries.crates-io.protocol`
 * Type: string
-* Default: `sparse`
+* Default: `"sparse"`
 * Environment: `CARGO_REGISTRIES_CRATES_IO_PROTOCOL`
 
 Specifies the protocol used to access crates.io. Allowed values are `git` or `sparse`.