Fix syntax highlight and typo in docs (#712)

docs/arguments.md

@@ -39,7 +39,7 @@ Environment Variable: N/A
 
 ## Time Zone
 Sets the time zone to be used by WatchTower's logs and the optional Cron scheduling argument (--schedule). If this environment variable is not set, Watchtower will use the default time zone: UTC.
-To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezome can alternatively be set by volume mounting your hosts /etc/timezone file. `-v /etc/timezone:/etc/timezone:ro`
+To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezone can alternatively be set by volume mounting your hosts /etc/timezone file. `-v /etc/timezone:/etc/timezone:ro`
 
 ```
             Argument: N/A

docs/http-api-mode.md

@@ -6,7 +6,7 @@ Watchtower provides an HTTP API mode that enables an HTTP endpoint that can be r
 
 To enable this mode, use the flag `--http-api`. For example, in a Docker Compose config file:
 
-```json
+```yaml
 version: '3'
 
 services:

docs/running-multiple-instances.md

@@ -8,7 +8,7 @@ To define an instance monitoring scope, use the `--scope` argument or the `WATCH
 
 For example, in a Docker Compose config file:
 
-```json
+```yaml
 version: '3'
 
 services:

docs/usage-overview.md

@@ -41,7 +41,7 @@ docker run -d \
 
 If you mount the config file as described above, be sure to also prepend the URL for the registry when starting up your watched image (you can omit the https://). Here is a complete docker-compose.yml file that starts up a docker container from a private repo at Docker Hub and monitors it with watchtower. Note the command argument changing the interval to 30s rather than the default 5 minutes.
 
-```json
+```yaml
 version: "3"
 services:
   cavo: