runtime: config: linux: Fix typo and trailing commas in json example
runtime: config: linux: Fix typo and trailing commas in json example

Signed-off-by: Antonio Murdaca <f9809039ea4850e75dcb8d80b778844aa463358f@linux.com>

wangkirin/specs,wking/opencontainer-specs,cloudfoundry-incubator/specs,laijs/specs,zenlinTechnofreak/specs,gao-feng/specs,marcosnils/specs,vbatts/specs,ujuc/specs,opencontainers/specs,opencontainers/runtime-spec,HardikDR/specs,jonboulle/specs,mheon/specs,hqhq/specs,ChengTiesheng/specs,wking/opencontainer-runtime-spec,runcom/specs,hqhq/runtime-spec