Only gitignore generated tsconfigs, not all

`tsconfig.json` matched *all* tsconfig.json files but it was only meant for the tsconfig in the repository root.
Stumbled on this when I was adding tsconfigs for #494.

Author: hlxid

.gitignore

@@ -56,7 +56,7 @@ lerna-debug.log
 install.json
 
 # Autogenerated tsconfig.json files
-tsconfig.json
-samples/tsconfig.json
-services/tsconfig.json
-utils/tsconfig.json
+/tsconfig.json
+/samples/tsconfig.json
+/services/tsconfig.json
+/utils/tsconfig.json

.prettierignore

@@ -3,7 +3,7 @@ docs/build
 coverage
 
 # Autogenerated tsconfig.json files
-tsconfig.json
-samples/tsconfig.json
-services/tsconfig.json
-utils/tsconfig.json
+/tsconfig.json
+/samples/tsconfig.json
+/services/tsconfig.json
+/utils/tsconfig.json