Exclude checkpoints from repo

Author: s0

writing-npm-libraries-using-typescript/.gitignore

@@ -1 +1,2 @@
-my-amazing-package
+my-amazing-package
+.ipynb_checkpoints

writing-npm-libraries-using-typescript/.ipynb_checkpoints/Lesson-checkpoint.ipynb

@@ -310,11 +310,11 @@
     "\n",
     "### Running `tsc`\n",
     "\n",
-    "We need a way now to run the command line program `tsc`, provided by the typescript package,\n",
-    "so that we can set up the project and compile the typescript code.\n",
+    "We need a way now to run the command line program `tsc`,\n",
+    "so that we can set up the project and compile the TypeScript code.\n",
     "\n",
     "However, as we installed the package locally rather than globally,\n",
-    "we can't directly use the commands.\n",
+    "we can't directly use the `tsc` command in our terminal.\n",
     "\n",
     "Luckily, you can access locally installed binaries from custom scripts in `package.json`,\n",
     "and then use them just like normal programs.\n",