docs: few minor changes on doc description came out of cl/512701532

PiperOrigin-RevId: 521002986

google/cloud/iap/v1/service.proto

@@ -1,4 +1,4 @@
-// Copyright 2022 Google LLC
+// Copyright 2023 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -456,7 +456,6 @@ message ReauthSettings {
     // Prompts the user to log in again.
     LOGIN = 1;
 
-    // Deprecated, no longer accepted by IAP APIs.
     PASSWORD = 2 [deprecated = true];
 
     // User must use their secure key 2nd factor device.
@@ -551,7 +550,7 @@ message AttributePropagationSettings {
   // credential maps to a "field" in the response. For example, selecting JWT
   // will propagate all attributes in the IAP JWT, header in the headers, etc.
   enum OutputCredentials {
-    // No output credential. This is an unsupported default.
+    // An output credential is required.
     OUTPUT_CREDENTIALS_UNSPECIFIED = 0;
 
     // Propagate attributes in the headers with "x-goog-iap-attr-" prefix.
@@ -566,25 +565,31 @@ message AttributePropagationSettings {
     RCTOKEN = 3;
   }
 
-  // Raw string CEL expression. Must return a list of attributes. Maximum of 45
-  // attributes can be selected. Expressions can select different attribute
+  // Raw string CEL expression. Must return a list of attributes. A maximum of
+  // 45 attributes can be selected. Expressions can select different attribute
   // types from `attributes`: `attributes.saml_attributes`,
-  // `attributes.iap_attributes`. Limited functions are supported:
-  //  - `filter: <list>.filter(<iter_var>, <predicate>)` -> returns a subset of
+  // `attributes.iap_attributes`. The following functions are supported:
+  //
+  //  - filter `<list>.filter(<iter_var>, <predicate>)`: Returns a subset of
   //  `<list>` where `<predicate>` is true for every item.
-  //  - `in: <var> in <list>` -> returns true if `<list>` contains `<var>`
-  //  - `selectByName: <list>.selectByName(<string>)` -> returns the attribute
+  //
+  //  - in `<var> in <list>`: Returns true if `<list>` contains `<var>`.
+  //
+  //  - selectByName `<list>.selectByName(<string>)`: Returns the attribute
   //  in
   //  `<list>` with the given `<string>` name, otherwise returns empty.
-  //  - `emitAs: <attribute>.emitAs(<string>)` -> sets the `<attribute>` name
+  //
+  //  - emitAs `<attribute>.emitAs(<string>)`: Sets the `<attribute>` name
   //  field to the given `<string>` for propagation in selected output
   //  credentials.
-  //  - `strict: <attribute>.strict()` -> ignore the `x-goog-iap-attr-` prefix
-  //  for the provided `<attribute>` when propagating via the `HEADER` output
-  //  credential, i.e. request headers.
-  //  - `append: <target_list>.append(<attribute>)` OR
-  //  `<target_list>.append(<list>)` -> append the provided `<attribute>` or
-  //  `<list>` onto the end of `<target_list>`.
+  //
+  //  - strict `<attribute>.strict()`: Ignores the `x-goog-iap-attr-` prefix
+  //  for the provided `<attribute>` when propagating with the `HEADER` output
+  //  credential, such as request headers.
+  //
+  //  - append `<target_list>.append(<attribute>)` OR
+  //  `<target_list>.append(<list>)`: Appends the provided `<attribute>` or
+  //  `<list>` to the end of `<target_list>`.
   //
   // Example expression: `attributes.saml_attributes.filter(x, x.name in
   // ['test']).append(attributes.iap_attributes.selectByName('exact').emitAs('custom').strict())`