Fixes doc gen webhook based on review comments.   * (M) webhook/main.go     - Updated mutex unlock to add defer statements     - Added checks for existence of script file     - Minor fix to comments
Fixes doc gen webhook based on review comments.
  * (M) webhook/main.go
    - Updated mutex unlock to add defer statements
    - Added checks for existence of script file
    - Minor fix to comments

openconfig/models-ci,openconfig/models-ci