Docs: Fix examples values in docs (#15878)
Docs: Fix examples values in docs (#15878)

Before:

```
extraEnv: "- name: AIRFLOW__CORE__LOAD_EXAMPLES\n   value: True"
```

After:

```
extraEnvFrom:
  secretRef:
    name: '{{ .Release.Name }}-airflow-connections'
extraEnvFrom:
  configMapRef:
    name: '{{ .Release.Name }}-airflow-variables'
```
dhuang/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,apache/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,bolkedebruin/airflow,sekikn/incubator-airflow,apache/airflow,apache/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,dhuang/incubator-airflow,mistercrunch/airflow,apache/incubator-airflow,lyft/incubator-airflow,apache/airflow,dhuang/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,dhuang/incubator-airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,bolkedebruin/airflow,mistercrunch/airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,apache/incubator-airflow,sekikn/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow