fix headings and links in the table of contents (ktr0731#660)

README.md

@@ -37,7 +37,7 @@ So, you can format it by any commands like `jq`. Also, if you want to use the sa
    - [From GitHub Releases](#from-github-releases)
    - [macOS](#macos)
    - [Docker image](#docker-image)
-   - [[Not-recommended] go get](#not-recommended-go-get)
+   - [[Not-recommended] go install](#not-recommended-go-install)
 - [Usage (REPL)](#usage-repl)
    - [Basic usage](#basic-usage)
    - [Repeated fields](#repeated-fields)
@@ -46,7 +46,7 @@ So, you can format it by any commands like `jq`. Also, if you want to use the sa
    - [Client streaming RPC](#client-streaming-rpc)
    - [Server streaming RPC](#server-streaming-rpc)
    - [Bidirectional streaming RPC](#bidirectional-streaming-rpc)
-   - [Skip the rest of fields](#skip-the-rest-of-fields)
+   - [Skip the rest of the fields](#skip-the-rest-of-the-fields)
    - [Enriched response](#enriched-response)
    - [Repeat the previous call](#repeat-the-previous-call)
 - [Usage (CLI)](#usage-cli)