Follow up build instructions on bazelisk (#1184)

This follows up to our previous commit [1], which introduced

  .bazelversion

so that we can centralize where to specify the expected version of Bazel
in our CI and build instructions.

This commit replaces the remaining usage of

  bazel

command with

  bazelisk

command then explain where the expected bazel version is specified.

This is just a documentation change. There must be no behavior change in
the final artifacts.

 [1]: 8d704f0

PiperOrigin-RevId: 728118770

docs/build_mozc_in_osx.md

@@ -22,7 +22,7 @@ python3 build_tools/update_deps.py
 # CMake is also required to build Qt.
 python3 build_tools/build_qt.py --release --confirm_license
 
-MOZC_QT_PATH=${PWD}/third_party/qt bazel build package --config oss_macos --config release_build
+MOZC_QT_PATH=${PWD}/third_party/qt bazelisk build package --config oss_macos --config release_build
 open bazel-bin/mac/Mozc.pkg
 ```
 
@@ -49,8 +49,9 @@ Building on Mac requires the following software.
 * [Xcode](https://apps.apple.com/us/app/xcode/id497799835)
   * Xcode 13 (macOS 13 SDK) or later
   * ⚠️Xcode Command Line Tools aren't sufficient.
-* [Bazel](https://docs.bazel.build/versions/master/install-os-x.html) for Bazel build
-  * check [src/.bazelversion](../src/.bazelversion) for the supported Bazel version.
+* [Bazelisk](https://github.com/bazelbuild/bazelisk)
+  * Bazelisk is a wrapper of [Bazel](https://bazel.build/) to use the specific version of Bazel.
+  * [src/.bazeliskrc](../src/.bazeliskrc) controls which version of Bazel is used.
 * Python 3.9 or later with the following pip module.
   * `requests`
 * CMake 3.18.4 or later (to build Qt6)

docs/build_mozc_in_windows.md

@@ -167,7 +167,8 @@ Note that you can specify `--qtdir=` option instead of `--noqt` in GYP phase sin
 Additional requirements:
 
 * [Bazelisk](https://github.com/bazelbuild/bazelisk)
-  * Bazelisk is a wrapper of [Bazel](https://bazel.build/) to use the specific version of Bazel.
+  * Bazelisk is a wrapper of [Bazel](https://bazel.build) to use the specific version of Bazel.
+  * [src/.bazeliskrc](../src/.bazeliskrc) controls which version of Bazel is used.
 * [MSYS2](https://github.com/msys2/msys2)
 
 After running `build_tools/update_deps.py` and `build_tools/build_qt.py`, run the following command instead of `build_mozc.py`: