anchor.diff:  
   <h3 class="h3-caps">BUILDKITE_BUILD_AUTHOR</h3>
   
  -The name of the user who authored the commit being built. This value can be blank in some situations, including builds manually triggered using API or Buildkite web interface. The value cannot be modified as an environment variable.
  +The name of the user who authored the commit being built. This value can be blank in some situations, including builds manually triggered using API or Buildkite web interface. The value cannot be modified.
   
   Example: `"Carol Danvers"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_AUTHOR_EMAIL</h3>
   
  -The notification email of the user who authored the commit being built. This value can be blank in some situations, including builds manually triggered using API or Buildkite web interface. The value cannot be modified as an environment variable.
  +The notification email of the user who authored the commit being built. This value can be blank in some situations, including builds manually triggered using API or Buildkite web interface. The value cannot be modified.
   
   Example: `"cdanvers@kree-net.com"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_CREATOR</h3>
   
  -The name of the user who created the build. The value cannot be modified as an environment variable.
  +The name of the user who created the build. The value cannot be modified.
   
   Example: `"Carol Danvers"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_CREATOR_EMAIL</h3>
   
  -The notification email of the user who created the build. The value cannot be modified as an environment variable.
  +The notification email of the user who created the build. The value cannot be modified.
   
   Example: `"cdanvers@kree-net.com"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_CREATOR_TEAMS</h3>
   
  -A colon separated list of non-private team names that the build creator belongs to. The value cannot be modified as an environment variable.
  +A colon separated list of non-private team names that the build creator belongs to. The value cannot be modified.
   
   Example: `"everyone:platform"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_ID</h3>
   
  -The UUID of the build. The value cannot be modified as an environment variable.
  +The UUID of the build. The value cannot be modified.
   
   Example: `"4735ba57-80d0-46e2-8fa0-b28223a86586"`
   
   <h3 class="h3-caps">BUILDKITE_BUILD_NUMBER</h3>
   
  -The build number. This number increases by 1 with every build, and is guaranteed to be unique within each pipeline. The value cannot be modified as an environment variable.
  +The build number. This number increases by 1 with every build, and is guaranteed to be unique within each pipeline. The value cannot be modified.
   
   Example: `"1514"`
   
  
positive.code: 
  <h3 class="h3-caps">BUILDKITE_BRANCH</h3>
  
  The branch being built. The value cannot be modified as an environment variable.
  
  Example: `"master"`
  
  
negative.code: 
  <h3 class="h3-caps">BUILDKITE_MESSAGE</h3>
  
  The message associated with the build, usually the commit message. The value cannot be modified.
  
  Example: `"Added a great new feature"`
  
  <h3 class="h3-caps">BUILDKITE_ORGANIZATION_SLUG</h3>
  
  The organization name on Buildkite as used in URLs. The value cannot be modified.
  
  Example: `"acme-inc"`
  
  