C#: Fix compiler warnings related to errors in XML comments.

csharp/autobuilder/Semmle.Autobuild.Shared/Autobuilder.cs

@@ -195,7 +195,7 @@ namespace Semmle.Autobuild.Shared
         }
 
         /// <summary>
-        /// Retrieves the value of an environment variable named <paramref name="name"> or throws
+        /// Retrieves the value of an environment variable named <paramref name="name"/> or throws
         /// an exception if no such environment variable has been set.
         /// </summary>
         /// <param name="name">The name of the environment variable.</param>
@@ -228,7 +228,7 @@ namespace Semmle.Autobuild.Shared
         private readonly IDiagnosticsWriter diagnostics;
 
         /// <summary>
-        /// Makes <see cref="path" /> relative to the root source directory.
+        /// Makes <paramref name="path"/> relative to the root source directory.
         /// </summary>
         /// <param name="path">The path which to make relative.</param>
         /// <returns>The relative path.</returns>

csharp/autobuilder/Semmle.Autobuild.Shared/MarkdownUtil.cs

@@ -22,7 +22,7 @@ namespace Semmle.Autobuild.Shared
         public static string ToMarkdownLink(this string link, string title) => $"[{title}]({link})";
 
         /// <summary>
-        /// Renders <see cref="projects" /> as a markdown list of the project paths.
+        /// Renders <paramref name="projects"/> as a markdown list of the project paths.
         /// </summary>
         /// <param name="projects">
         /// The list of projects whose paths should be rendered as a markdown list.
@@ -35,7 +35,7 @@ namespace Semmle.Autobuild.Shared
         }
 
         /// <summary>
-        /// Renders <see cref="items" /> as a markdown list.
+        /// Renders <paramref name="items" /> as a markdown list.
         /// </summary>
         /// <typeparam name="T">The item type.</typeparam>
         /// <param name="items">The list that should be formatted as a markdown list.</param>