Revert "add diagnostic dynamic long description"

This reverts commit a0bbbcf.

_specifications/lsp/3.18/types/diagnostic.md

@@ -151,19 +151,8 @@ export interface DiagnosticRelatedInformation {
  */
 export interface CodeDescription {
 	/**
-	 * An URI to open with general information about the diagnostic error (e.g.
-	 * paragraphs of a description, code examples, exceptions, links to sources).
-	 * The URI can start with "file:", "https:", or other.
+	 * An URI to open with more information about the diagnostic error.
 	 */
-	href?: URI;
-
-	/**
-	 * A string with unique information about this particular instance of the
-	 * diagnostic error (e.g. a warning that mentions your variable name
-	 * specifcally and the function it was defined in).
-	 *
-	 * @since 3.18.0
-	 */
-	dynamicDescription?: string;
+	href: URI;
 }
-```
+```