docs: write the release notes without pronouns

The release page is public text like the site. render() said "finds
your setup", "file for your system" and "your BIOS folder". The
pronoun test now renders the notes from release.json, once more with
a pack in parts, and fails on any pronoun the script writes.

scripts/release_notes.py

@@ -126,7 +126,7 @@ def render(record: dict, platforms_dir: str, whats_new: str) -> str:
     lines = [
         "### Install in one command",
         "",
-        "It finds your setup and its BIOS folder, then downloads only what is missing.",
+        "It finds the setup and its BIOS folder, then downloads only what is missing.",
         "",
         "**Linux, macOS, Steam Deck**",
         "```sh",
@@ -138,12 +138,12 @@ def render(record: dict, platforms_dir: str, whats_new: str) -> str:
         install_command("powershell"),
         "```",
         "",
-        (f"**On a handheld**: copy the `RetroBIOS` file for your system to the card"
+        (f"**On a handheld**: copy the `RetroBIOS` file for the system to the card"
          f" ([which one]({SITE}wiki/installer/#on-a-handheld-the-retrobios-port))."),
         "",
         "### Or download a pack",
         "",
-        "Extract it into your BIOS folder.",
+        "Extract it into the BIOS folder.",
         "",
     ]
     if any(len(pack["assets"]) > 1 for pack in packs.values()):