Docs: c++11 -> c++14

[smessmer]

Stack from ghstack:

• Docs: c++11 -> c++14 #30530 Docs: c++11 -> c++14

Switch some mentions of "C++11" in the docs to "C++14"

Differential Revision: D18733733

[kostmo]

CircleCI build failures summary

As of commit d60c803:

• 2/4 broken upstream at merge base 643ca5d (see grid view)
  • You may want to rebase on the viable/strict branch (see its recency history):
    • If your commit is newer than viable/strict, you can try basing on an older, stable commit:

      git fetch viable/strict
      git rebase --onto viable/strict $(git merge-base origin/master HEAD)
      

    • If your commit is older than viable/strict:

      git fetch viable/strict
      git rebase viable/strict
      

• 2/4 failures introduced in this PR

Detailed failure analysis

One may explore the probable reasons each build failed interactively on the Dr. CI website.

2 new failures recognized by patterns

The following build failures don't appear to be due to upstream breakage:

pytorch_windows_test2 (1/2)

Step: "Test" (full log | pattern match details)

- cmake (exited 1) - cmake not installed. An error occurred during installation:

 The remote server returned an error: (503) Server Unavailable. Service Unavailable 
cmake package files install completed. Performing other installation steps. 
The install of cmake was NOT successful. 
cmake not installed. An error occurred during installation: 
 The remote server returned an error: (503) Server Unavailable. Service Unavailable 
 
Chocolatey installed 0/1 packages. 1 packages failed. 
 See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log). 
 
Failures 
 - cmake (exited 1) - cmake not installed. An error occurred during installation: 
 The remote server returned an error: (503) Server Unavailable. Service Unavailable 

pytorch_windows_test1 (2/2)

Step: "Test" (full log | pattern match details)

- cmake (exited 1) - cmake not installed. An error occurred during installation:

 The remote server returned an error: (503) Server Unavailable. Service Unavailable 
cmake package files install completed. Performing other installation steps. 
The install of cmake was NOT successful. 
cmake not installed. An error occurred during installation: 
 The remote server returned an error: (503) Server Unavailable. Service Unavailable 
 
Chocolatey installed 0/1 packages. 1 packages failed. 
 See the log for details (C:\ProgramData\chocolatey\logs\chocolatey.log). 
 
Failures 
 - cmake (exited 1) - cmake not installed. An error occurred during installation: 
 The remote server returned an error: (503) Server Unavailable. Service Unavailable 

2 upstream failures recognized by patterns:

These builds matched patterns, but were probably caused by upstream breakages:

• caffe2_onnx_py3_6_clang7_ubuntu16_04_test
• caffe2_onnx_py2_gcc5_ubuntu16_04_test

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This pull request has been merged in 5554e5b.