Fix typos found by codespell (#650)

Author: DimitriPapadopoulos

dist/setup/index.js

@@ -69290,7 +69290,7 @@ const core = __importStar(__nccwpck_require__(2186));
 const tc = __importStar(__nccwpck_require__(7784));
 // Python has "scripts" or "bin" directories where command-line tools that come with packages are installed.
 // This is where pip is, along with anything that pip installs.
-// There is a seperate directory for `pip install --user`.
+// There is a separate directory for `pip install --user`.
 //
 // For reference, these directories are as follows:
 //   macOS / Linux:

docs/advanced-usage.md

@@ -426,7 +426,7 @@ jobs:
       with:
         python-version: "3.8.0"
         cache: "poetry"
-    - run: echo '${{ steps.cp310.outputs.cache-hit }}' # true if cache-hit occured on the primary key
+    - run: echo '${{ steps.cp310.outputs.cache-hit }}' # true if cache-hit occurred on the primary key
 ```
 
 ## Environment variables

src/find-python.ts

@@ -11,7 +11,7 @@ import * as tc from '@actions/tool-cache';
 
 // Python has "scripts" or "bin" directories where command-line tools that come with packages are installed.
 // This is where pip is, along with anything that pip installs.
-// There is a seperate directory for `pip install --user`.
+// There is a separate directory for `pip install --user`.
 //
 // For reference, these directories are as follows:
 //   macOS / Linux: