Fix xmldoc comments (#9704)

The xmldoc comments are treated as plain-text if a `summary` tag is not present.

Author: deviousasti

src/fsharp/service/FSharpCheckerResults.fsi

@@ -235,11 +235,11 @@ type public FSharpCheckFileResults =
     /// Find the most precise display environment for the given line and column.
     member GetDisplayContextForPos : pos : pos -> Async<FSharpDisplayContext option>
 
-    /// Determines if a long ident is resolvable at a specific point.
+    /// <summary>Determines if a long ident is resolvable at a specific point.</summary>
     /// <param name="userOpName">An optional string used for tracing compiler operations associated with this request.</param>
     member internal IsRelativeNameResolvable: cursorPos : pos * plid : string list * item: Item * ?userOpName: string -> Async<bool>
 
-    /// Determines if a long ident is resolvable at a specific point.
+    /// <summary>Determines if a long ident is resolvable at a specific point.</summary>
     /// <param name="userOpName">An optional string used for tracing compiler operations associated with this request.</param>
     member IsRelativeNameResolvableFromSymbol: cursorPos : pos * plid : string list * symbol: FSharpSymbol * ?userOpName: string -> Async<bool>
 
@@ -399,4 +399,4 @@ type internal FsiInteractiveChecker =
 module internal FSharpCheckerResultsSettings =
     val defaultFSharpBinariesDir: string
 
-    val maxTimeShareMilliseconds : int64
+    val maxTimeShareMilliseconds : int64