don't assert when validation is skipped (#111596)

Author: PranavSenthilnathan

src/libraries/Fuzzing/DotnetFuzzing/Fuzzers/Utf8JsonWriterFuzzer.cs

@@ -119,7 +119,7 @@ public void FuzzTarget(ReadOnlySpan<byte> bytes)
         }
 
         // Additional test for mixing UTF-8 and UTF-16 encoding. The alignment math is easier in UTF-16 mode so just run it for that.
-        if (encoding == Utf16EncodingFlag)
+        if (encoding == Utf16EncodingFlag && !options.SkipValidation)
         {
             Array.Clear(expectedBuffer);
 

src/libraries/System.Text.Json/src/System/Text/Json/Writer/Utf8JsonWriter.WriteValues.StringSegment.cs

@@ -18,7 +18,7 @@ public sealed partial class Utf8JsonWriter
         /// Thrown when the specified value is too large.
         /// </exception>
         /// <exception cref="InvalidOperationException">
-        /// Thrown if this would result in invalid JSON being written (while validation is enabled) or
+        /// Thrown when validation is enabled if this would result in invalid JSON being written or
         /// if the previously written segment (if any) was not written with this same overload.
         /// </exception>
         /// <remarks>
@@ -186,7 +186,7 @@ private void WriteStringSegmentData(ReadOnlySpan<char> escapedValue)
         /// Thrown when the specified value is too large.
         /// </exception>
         /// <exception cref="InvalidOperationException">
-        /// Thrown if this would result in invalid JSON being written (while validation is enabled) or
+        /// Thrown when validation is enabled if this would result in invalid JSON being written or
         /// if the previously written segment (if any) was not written with this same overload.
         /// </exception>
         /// <remarks>
@@ -353,7 +353,7 @@ private void WriteStringSegmentData(ReadOnlySpan<byte> escapedValue)
         /// Thrown when the specified value is too large.
         /// </exception>
         /// <exception cref="InvalidOperationException">
-        /// Thrown if this would result in invalid JSON being written (while validation is enabled) or
+        /// Thrown when validation is enabled if this would result in invalid JSON being written or
         /// if the previously written segment (if any) was not written with this same overload.
         /// </exception>
         public void WriteBase64StringSegment(ReadOnlySpan<byte> value, bool isFinalSegment)