Remove space in toc.yml generation

Author: ansMHanmer

doc/source/operators_doc/toc_template.j2

@@ -1,6 +1,6 @@
 - name: Introduction
   href: index.md
-{% for category in data %}
+{% for category in data -%}
 - name: {{ category.category }}
   items:{% for operator in category.operators %}
   - name: {{ operator.operator_name }}