Typo Fixes (#6803)

src/api/dotnet/Context.cs

@@ -3770,7 +3770,7 @@ namespace Microsoft.Z3
         }
 
         /// <summary>
-        /// Create a simplifie that applies <paramref name="t1"/> and
+        /// Create a simplifier that applies <paramref name="t1"/> and
         /// then <paramref name="t2"/>.
         /// </summary>
         public Simplifier AndThen(Simplifier t1, Simplifier t2, params Simplifier[] ts)

src/api/dotnet/Symbol.cs

@@ -97,7 +97,7 @@ namespace Microsoft.Z3
         }
 
         /// <summary>
-        /// The Symbols's hash code.
+        /// The Symbol's hash code.
         /// </summary>
         /// <returns>A hash code</returns>
         public override int GetHashCode()

src/api/dotnet/UserPropagator.cs

@@ -58,7 +58,7 @@ namespace Microsoft.Z3
         public delegate void CreatedEh(Expr term);
 
         /// <summary>
-        /// Delegate type for callback into solver's branching. The values can be overriden by calling <see cref="NextSplit" />.
+        /// Delegate type for callback into solver's branching. The values can be overridden by calling <see cref="NextSplit" />.
         /// </summary>
         /// <param name="term">A bit-vector or Boolean used for branching</param>
         /// <param name="idx">If the term is a bit-vector, then an index into the bit-vector being branched on</param>