title: substitute certain characters in strings found in an object
body: <p>I have a list of objects and want to replace all occurrences of <code>.</code> with <code>:</code> when the key is <code>Name</code> using <code>jq</code></p>
  
  <p>input: </p>
  
  <pre><code>{
    "Parameters": [
      {
        "Name": "TEST.AB.SOMETHING",
        "Value": "hvfuycsgvfiwbiwbibibewfiwbcfwifcbwibcibc"
      },
      {
        "Name": "TEST_GF_USER",
        "Value": "ssssecret"
      }
    ]
  }
  </code></pre>
  
  <p>expected output:</p>
  
  <pre><code>{
    "Parameters": [
      {
        "Name": "TEST:AB:SOMETHING",
        "Value": "hvfuycsgvfiwbiwbibibewfiwbcfwifcbwibcibc"
      },
      {
        "Name": "TEST_GF_USER",
        "Value": "ssssecret"
      }
    ]
  }
  </code></pre>