chore: add hedera-docs-committers to CODEOWNERS (#477)

Signed-off-by: Andrew Brandt <andrew.brandt@hashgraph.com>

Author: andrewb1269

.github/CODEOWNERS

@@ -1,5 +1,5 @@
 # Default code owners for entire repository
-*                                                       @hashgraph/hedera-docs
+*                                                       @hashgraph/hedera-docs-committers @hashgraph/hedera-docs
 
 #########################
 #####  Core Files  ######
@@ -24,4 +24,4 @@
 
 # Git Ignore definitions
 **/.gitignore                                           @hashgraph/platform-ci @hashgraph/release-engineering-managers @hashgraph/hedera-docs
-**/.gitignore.*                                         @hashgraph/platform-ci @hashgraph/release-engineering-managers @hashgraph/hedera-docs
+**/.gitignore.*                                         @hashgraph/platform-ci @hashgraph/release-engineering-managers @hashgraph/hedera-docs