Fix Linux font install for Python 3

install-chromeos-fonts.py references python, which is not guaranteed to
be installed (at least not on Googler machines). Instead, python2 and
python3 are guaranteed available (in depot_tools if not elsewhere).

This leads to this error message:

    Installing Chrome OS fonts.
    /usr/bin/env: ‘python’: No such file or directory
    ERROR: The installation of the Chrome OS default fonts failed.

The remainder of the error message is misleading (in this context) and
has a spelling error which this also fixes.

Change-Id: Ie05a95d654a51448240f3910dd4bb54a32f54336
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3539216
Reviewed-by: Thomas Anderson <[email protected]>
Commit-Queue: Bruce Dawson <[email protected]>
Cr-Commit-Position: refs/heads/main@{#983457}

build/install-build-deps.sh

@@ -736,7 +736,7 @@ if [ "$do_inst_chromeos_fonts" != "0" ]; then
       echo "This is expected if your repo is installed on a remote file system."
     fi
     echo "It is recommended to install your repo on a local file system."
-    echo "You can skip the installation of the Chrome OS default founts with"
+    echo "You can skip the installation of the Chrome OS default fonts with"
     echo "the command line option: --no-chromeos-fonts."
     exit 1
   fi

build/linux/install-chromeos-fonts.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.