docs(common): correct ST sequence metadata and comment typos

- EscapeSequenceParser: ESC ST is ESC backslash (0x1B 0x5C), not ESC
  plus a double-quote character; align @vt metadata with C1 ST on the
  following line.
- Color.contrastRatio: document l2 as the second luminance argument.
- Marker.dispose: fix "change" -> "chance" in dispose listener comment.
- Buffer.clear: fix possessive "it's" -> "its" in JSDoc.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/common/Color.ts

@@ -373,7 +373,7 @@ export function toPaddedHex(c: number): string {
 /**
  * Gets the contrast ratio between two relative luminance values.
  * @param l1 The first relative luminance.
- * @param l2 The first relative luminance.
+ * @param l2 The second relative luminance.
  * @see https://www.w3.org/TR/WCAG20/#contrast-ratiodef
  */
 export function contrastRatio(l1: number, l2: number): number {

src/common/buffer/Buffer.ts

@@ -142,7 +142,7 @@ export class Buffer extends Disposable implements IBuffer {
   }
 
   /**
-   * Clears the buffer to it's initial state, discarding all previous data.
+   * Clears the buffer to its initial state, discarding all previous data.
    */
   public clear(): void {
     this._stringCache.clear();

src/common/buffer/Marker.ts

@@ -30,7 +30,7 @@ export class Marker implements IMarker {
     }
     this.isDisposed = true;
     this.line = -1;
-    // Emit before super.dispose such that dispose listeners get a change to react
+    // Emit before super.dispose such that dispose listeners get a chance to react
     this._onDispose.fire();
     dispose(this._disposables);
     this._disposables.length = 0;

src/common/parser/EscapeSequenceParser.ts

@@ -18,7 +18,7 @@ import { ApcParser } from './ApcParser';
 // @vt: #Y   ESC   CSI   "Control Sequence Introducer"   "ESC ["   "Start of a CSI sequence."
 // @vt: #Y   ESC   OSC   "Operating System Command"      "ESC ]"   "Start of an OSC sequence."
 // @vt: #Y   ESC   DCS   "Device Control String"         "ESC P"   "Start of a DCS sequence."
-// @vt: #Y   ESC   ST    "String Terminator"             "ESC \"   "Terminator used for string type sequences."
+// @vt: #Y   ESC   ST    "String Terminator"             "ESC \\"   "Terminator used for string type sequences."
 // @vt: #Y   ESC   PM    "Privacy Message"               "ESC ^"   "Start of a privacy message."
 // @vt: #Y   ESC   APC   "Application Program Command"   "ESC _"   "Start of an APC sequence."
 // @vt: #Y   C1    CSI   "Control Sequence Introducer"   "\x9B"    "Start of a CSI sequence."