Merge pull request #743 from atlassian/htan/fix-dynamic-header-doc

fix dynamic header doc

Author: hstan

README.md

@@ -141,8 +141,7 @@ following configuration options:
 - `custom-headers` : a map of strings that are added to each request sent to allow for additional network routing / request inspection.
   Not required, default is empty. Example: `--custom-headers='{"region" : "us-east-1", "service" : "event-producer"}'`
 - `dynamic-headers` : similar with `custom-headers`, but the header values are extracted from metric tags matching the
-  provided list of string. Tag names are canonicalized by first replacing underscores with hyphens, then converting
-  first letter and each letter after a hyphen to uppercase, the rest are converted to lower case. If a tag is specified
+  provided list of string. Tag names are canonicalized by replacing underscores with hyphens. If a tag is specified
   in both `custom-header` and `dynamic-header`, the vaule set by `custom-header` takes precedence. Not required, default
   is empty. Example: `--dynamic-headers='["region", "service"]'`.
   This is an experimental feature and it may be removed or changed in future versions.