Remove incorrect "read-only file" exception from File.Read* method documentation (#11944)

Author: Copilot

xml/System.IO/File.xml

@@ -4744,12 +4744,7 @@ The following example moves a file.
         <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
         <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
-        <exception cref="T:System.UnauthorizedAccessException">
-          <paramref name="path" /> specified a file that is read-only.
-
- -or-
-
- This operation is not supported on the current platform.
+        <exception cref="T:System.UnauthorizedAccessException">This operation is not supported on the current platform.
 
  -or-
 
@@ -4847,12 +4842,7 @@ The following example moves a file.
         <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
         <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
-        <exception cref="T:System.UnauthorizedAccessException">
-          <paramref name="path" /> specified a file that is read-only.
-
- -or-
-
- This operation is not supported on the current platform.
+        <exception cref="T:System.UnauthorizedAccessException">This operation is not supported on the current platform.
 
  -or-
 
@@ -5054,12 +5044,7 @@ The following example moves a file.
         <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
         <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
-        <exception cref="T:System.UnauthorizedAccessException">
-          <paramref name="path" /> specified a file that is read-only.
-
- -or-
-
- This operation is not supported on the current platform.
+        <exception cref="T:System.UnauthorizedAccessException">This operation is not supported on the current platform.
 
  -or-
 
@@ -5161,12 +5146,7 @@ The following example moves a file.
         <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length. </exception>
         <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
-        <exception cref="T:System.UnauthorizedAccessException">
-          <paramref name="path" /> specified a file that is read-only.
-
- -or-
-
- This operation is not supported on the current platform.
+        <exception cref="T:System.UnauthorizedAccessException">This operation is not supported on the current platform.
 
  -or-