test: fix typos in test titles and comments

Apply test-only hunks from docs typo fixes: SharedRendererTests
duplicate word, SerializeAddon workaround comment, and mouse range
spelling in MouseService and InputHandler tests.

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>

addons/addon-serialize/test/SerializeAddon.test.ts

@@ -192,7 +192,7 @@ test.describe('SerializeAddon', () => {
     const cols = 10;
     const line = '+'.repeat(cols);
     const lines: string[] = [
-      sgr(FG_P16_GREEN) + line,  // Workaround: If we clear all flags a the end, serialize will use \x1b[0m to clear instead of the sepcific disable sequence
+      sgr(FG_P16_GREEN) + line,  // Workaround: If we clear all flags at the end, serialize will use \x1b[0m to clear instead of the specific disable sequence
       sgr(INVERSE) + line,
       sgr(BOLD) + line,
       sgr(UNDERLINED) + line,

src/browser/services/MouseService.test.ts

@@ -176,7 +176,7 @@ describe('MouseService _triggerMouseEvent', () => {
       for (let i = 0; i < bufferService.cols; ++i) {
         assert.equal(trigger({ col: i, row: 0, x: 0, y: 0, button: CoreMouseButton.LEFT, action: CoreMouseAction.DOWN }), true);
         if (i > 222) {
-          // supress mouse reports if we are out of addressible range (max. 222)
+          // suppress mouse reports if we are out of addressable range (max. 222)
           assert.deepEqual(toBytes(reports.pop()), []);
         } else {
           assert.deepEqual(toBytes(reports.pop()), [0x1b, 0x5b, 0x4d, 0x20, i + 33, 0x21]);

src/common/InputHandler.test.ts

@@ -1241,7 +1241,7 @@ describe('InputHandler', () => {
       await inputHandler.parseP('\x1b[e');
       assert.deepEqual(getCursor(bufferService), [8, 5]);
     });
-    describe('should clamp cursor into addressible range', () => {
+    describe('should clamp cursor into addressable range', () => {
       it('CUF', async () => {
         bufferService.buffer.x = 10000;
         bufferService.buffer.y = 10000;

test/playwright/SharedRendererTests.ts

@@ -980,7 +980,7 @@ export function injectSharedRendererTests(ctx: ISharedRendererTestContext): void
   });
 
   test.describe('selectionInactiveBackground', async () => {
-    test('should render the the inactive selection when not focused', async () => {
+    test('should render the inactive selection when not focused', async () => {
       const theme: ITheme = {
         selectionBackground: '#FF000080',
         selectionInactiveBackground: '#0000FF80'