docs: fix typo in Gin Quick Start (#3997) #1556

Job	Run time
lint	37s
ubuntu-latest @ Go 1.21	32s
ubuntu-latest @ Go 1.21 -tags nomsgpack	32s
ubuntu-latest @ Go 1.21 -tags "sonic avx"	1m 2s
ubuntu-latest @ Go 1.21 -tags go_json	46s
ubuntu-latest @ Go 1.21 -race	9s
ubuntu-latest @ Go 1.22	39s
ubuntu-latest @ Go 1.22 -tags nomsgpack	35s
ubuntu-latest @ Go 1.22 -tags "sonic avx"	59s
ubuntu-latest @ Go 1.22 -tags go_json	45s
ubuntu-latest @ Go 1.22 -race	10s
macos-latest @ Go 1.21	39s
macos-latest @ Go 1.21 -tags nomsgpack	45s
macos-latest @ Go 1.21 -tags "sonic avx"	46s
macos-latest @ Go 1.21 -tags go_json	45s
macos-latest @ Go 1.21 -race	21s
macos-latest @ Go 1.22	38s
macos-latest @ Go 1.22 -tags nomsgpack	37s
macos-latest @ Go 1.22 -tags "sonic avx"	1m 42s
macos-latest @ Go 1.22 -tags go_json	42s
macos-latest @ Go 1.22 -race	22s
	14m 3s

Provide feedback