Revert "ecmascript spelling (#407)"

This reverts commit 8e577d8.

Author: bakkot

src/lint/collect-spelling-diagnostics.ts

@@ -135,10 +135,6 @@ const matchers = [
     pattern: /(÷|÷)/gu,
     message: 'division should be written as "/", not "÷", per ISO 80000-2',
   },
-  {
-    pattern: /[Ee]cma[Ss]cript/gu,
-    message: "it's spelled ECMAScript",
-  },
 ];
 
 export function collectSpellingDiagnostics(

test/lint-spelling.js

@@ -535,30 +535,6 @@ windows:${M}\r
     );
   });
 
-  it('ECMAScript', async () => {
-    await assertLint(
-      positioned`
-        <p>${M}ecmascript</p>
-      `,
-      {
-        ruleId: 'spelling',
-        nodeType: 'html',
-        message: "it's spelled ECMAScript",
-      }
-    );
-
-    await assertLint(
-      positioned`
-        <p>${M}EcmaScript</p>
-      `,
-      {
-        ruleId: 'spelling',
-        nodeType: 'html',
-        message: "it's spelled ECMAScript",
-      }
-    );
-  });
-
   it('negative', async () => {
     await assertLintFree(`
       <p>