about: license: fix grammar in initial line (#1117)

Signed-off-by: S.M. Raihanul Bashir Hridoy <[email protected]>

Author: Hridoy-31

about/license.md

@@ -4,7 +4,7 @@ description: Strong Commitment to the Openness and Collaboration
 
 # License
 
-[Fluent Bit](http://fluentbit.io), including it core, plugins and tools are distributed under the terms of the [Apache License v2.0](http://www.apache.org/licenses/LICENSE-2.0):
+[Fluent Bit](http://fluentbit.io), including its core, plugins and tools are distributed under the terms of the [Apache License v2.0](http://www.apache.org/licenses/LICENSE-2.0):
 
 ```text
                                  Apache License