Fix docs tests on OTP 23 (#10510)

Author: ericmj

.github/workflows/ci.yml

@@ -13,6 +13,7 @@ jobs:
     name: Linux, ${{ matrix.otp_release }}, Ubuntu 16.04
     continue-on-error: ${{ matrix.development }}
     strategy:
+      fail-fast: false
       matrix:
         otp_release: ['OTP-23.0', 'OTP-22.3', 'OTP-22.0', 'OTP-21.3.8', 'OTP-21.0']
         development: [false]
@@ -29,7 +30,7 @@ jobs:
       - name: Install Erlang/OTP
         run: |
           cd $RUNNER_TEMP
-          wget -O otp.tar.gz https://repo.hex.pm/builds/otp/ubuntu-14.04/${{ matrix.otp_release }}.tar.gz
+          wget -O otp.tar.gz https://repo.hex.pm/builds/otp/ubuntu-16.04/${{ matrix.otp_release }}.tar.gz
           mkdir -p otp
           tar zxf otp.tar.gz -C otp --strip-components=1
           otp/Install -minimal $(pwd)/otp