docs: fix displayName typo (#219)

Author: therealharpaljadeja

pages/en/developing/unit-testing-framework.mdx

@@ -376,7 +376,7 @@ describe('handleUpdatedGravatars', () => {
   })
 
   test('Upates the displayName', () => {
-    assert.fieldEquals('Gravatar', '0x0', 'displayNamd', 'First Gravatar')
+    assert.fieldEquals('Gravatar', '0x0', 'displayName', 'First Gravatar')
 
     // code that should update the displayName to 1st Gravatar
 
@@ -425,7 +425,7 @@ describe("handleNewGravatar", () => {
 
 describe("handleUpdatedGravatar", () => {
   test("Upates the displayName", () => {
-     assert.fieldEquals("Gravatar", "0x0", "displayNamd", "First Gravatar")
+     assert.fieldEquals("Gravatar", "0x0", "displayName", "First Gravatar")
 
     // code that should update the displayName to 1st Gravatar
 
@@ -465,7 +465,7 @@ describe("handleUpdatedGravatar", () => {
   })
 
   test("Upates the displayName", () => {
-     assert.fieldEquals("Gravatar", "0x0", "displayNamd", "First Gravatar")
+     assert.fieldEquals("Gravatar", "0x0", "displayName", "First Gravatar")
 
     // code that should update the displayName to 1st Gravatar