fix typos (#1800)

Author: samir-dahal

Dapper/SqlMapper.Async.cs

@@ -81,7 +81,7 @@ public static Task<dynamic> QuerySingleOrDefaultAsync(this IDbConnection cnn, Co
         /// <param name="commandTimeout">The command timeout (in seconds).</param>
         /// <param name="commandType">The type of command to execute.</param>
         /// <returns>
-        /// A sequence of data of <typeparamref name="T"/>; if a basic type (int, string, etc) is queried then the data from the first column in assumed, otherwise an instance is
+        /// A sequence of data of <typeparamref name="T"/>; if a basic type (int, string, etc) is queried then the data from the first column is assumed, otherwise an instance is
         /// created per row, and a direct column-name===member-name mapping is assumed (case insensitive).
         /// </returns>
         public static Task<IEnumerable<T>> QueryAsync<T>(this IDbConnection cnn, string sql, object param = null, IDbTransaction transaction = null, int? commandTimeout = null, CommandType? commandType = null) =>
@@ -276,7 +276,7 @@ public static Task<object> QuerySingleOrDefaultAsync(this IDbConnection cnn, Typ
         /// <param name="cnn">The connection to query on.</param>
         /// <param name="command">The command used to query on this connection.</param>
         /// <returns>
-        /// A sequence of data of <typeparamref name="T"/>; if a basic type (int, string, etc) is queried then the data from the first column in assumed, otherwise an instance is
+        /// A sequence of data of <typeparamref name="T"/>; if a basic type (int, string, etc) is queried then the data from the first column is assumed, otherwise an instance is
         /// created per row, and a direct column-name===member-name mapping is assumed (case insensitive).
         /// </returns>
         public static Task<IEnumerable<T>> QueryAsync<T>(this IDbConnection cnn, CommandDefinition command) =>