[Bugfix] - Adjust number formatting string to not fail (#1873)

## Summary:
The formatting string for `srPointAtCoordinates` was missing an 's', which was causing a malformed string when extracted for use in Webapp.

Author: mark-fitzgerald

Reviewers: nishasy, #perseus

Required Reviewers:

Approved By: nishasy

Checks: ✅ Publish npm snapshot (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ gerald, 🚫 Publish npm snapshot (ubuntu-latest, 20.x), 🚫 Check for .changeset entries for all changed files (ubuntu-latest, 20.x), 🚫 Cypress (ubuntu-latest, 20.x), 🚫 Check builds for changes in size (ubuntu-latest, 20.x), 🚫 Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ gerald, 🚫 Publish npm snapshot (ubuntu-latest, 20.x), 🚫 Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 20.x), 🚫 Check builds for changes in size (ubuntu-latest, 20.x), ✅ gerald

Pull Request URL: #1873

.changeset/sweet-sheep-cover.md

@@ -0,0 +1,5 @@
+---
+"@khanacademy/perseus": patch
+---
+
+[BUGFIX] - Adjust parameter name in srPointAtCoordinates to account for variable name conflict

packages/perseus/src/strings.ts

@@ -321,7 +321,7 @@ export const strings: {
     graphKeyboardPrompt: "Press Shift + Enter to interact with the graph",
     srPointAtCoordinates: {
         context: "Screenreader-accessible description of a point on a graph",
-        message: "Point %(num) at %(x)s comma %(y)s",
+        message: "Point %(num)s at %(x)s comma %(y)s",
     },
     srInteractiveElements: "Interactive elements: %(elements)s",
     srNoInteractiveElements: "No interactive elements",