Fix various typo's (IdentityServer#4135)

* fix a few typos

* fix typo in contributing.md file

.github/CONTRIBUTING.md

@@ -5,7 +5,7 @@ Then we can decide if and how a feature or a change could be implemented and if
 
 Also read this first: [Being a good open source citizen](https://hackernoon.com/being-a-good-open-source-citizen-9060d0ab9732#.x3hocgw85)
 
-## Found and issue or a bug?
+## Found an issue or a bug?
 Please start a discussion on the [core repo issue tracker](https://github.com/IdentityServer/IdentityServer4/issues).
 
 ## Filing issues

docs/reference/client.rst

@@ -94,7 +94,7 @@ Token
 ``AlwaysSendClientClaims``
     If set, the client claims will be sent for every flow. If not, only for client credentials flow (default is `false`)
 ``AlwaysIncludeUserClaimsInIdToken``
-    When requesting both an id token and access token, should the user claims always be added to the id token instead of requring the client to use the userinfo endpoint. Default is `false`.
+    When requesting both an id token and access token, should the user claims always be added to the id token instead of requiring the client to use the userinfo endpoint. Default is `false`.
 ``ClientClaimsPrefix``
     If set, the prefix client claim types will be prefixed with. Defaults to `client_`. The intent is to make sure they don't accidentally collide with user claims.
 ``PairWiseSubjectSalt``

docs/reference/options.rst

@@ -35,7 +35,7 @@ The ``CustomEntries`` dictionary allows adding custom elements to the discovery
 Authentication
 ^^^^^^^^^^^^^^
 * ``CookieAuthenticationScheme``
-    Sets the cookie authentication scheme confgured by the host used for interactive users. If not set, the scheme will be inferred from the host's default authentication scheme. This setting is typically used when AddPolicyScheme is used in the host as the default scheme.
+    Sets the cookie authentication scheme configured by the host used for interactive users. If not set, the scheme will be inferred from the host's default authentication scheme. This setting is typically used when AddPolicyScheme is used in the host as the default scheme.
 
 * ``CookieLifetime``
     The authentication cookie lifetime (only effective if the IdentityServer-provided cookie handler is used).

src/IdentityServer4/src/Configuration/DependencyInjection/Options/AuthenticationOptions.cs

@@ -12,7 +12,7 @@ namespace IdentityServer4.Configuration
     public class AuthenticationOptions
     {
         /// <summary>
-        /// Sets the cookie authenitcation scheme confgured by the host used for interactive users. If not set, the scheme will inferred from the host's default authentication scheme.
+        /// Sets the cookie authentication scheme configured by the host used for interactive users. If not set, the scheme will inferred from the host's default authentication scheme.
         /// This setting is typically used when AddPolicyScheme is used in the host as the default scheme.
         /// </summary>
         public string CookieAuthenticationScheme { get; set; }

src/Storage/src/Models/Client.cs

@@ -159,7 +159,7 @@ public ICollection<string> AllowedGrantTypes
         public ICollection<string> AllowedScopes { get; set; } = new HashSet<string>();
 
         /// <summary>
-        /// When requesting both an id token and access token, should the user claims always be added to the id token instead of requring the client to use the userinfo endpoint.
+        /// When requesting both an id token and access token, should the user claims always be added to the id token instead of requiring the client to use the userinfo endpoint.
         /// Defaults to <c>false</c>.
         /// </summary>
         public bool AlwaysIncludeUserClaimsInIdToken { get; set; } = false;