fix pull request template

Signed-off-by: Masaya Kataoka <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,6 +1,6 @@
 # Description
 
-> Example is here, please check example and comment out this sentence. Minimal example is [here](pull_request_samples/example_simple.md) and detailed example is [here](pull_request_samples/example_detail.md)
+> Please check examples and comment out this sentence. Minimal example is [here](pull_request_samples/example_simple.md) and detailed example is [here](pull_request_samples/example_detail.md)
 
 ## Abstract