docs: Improve info about origin (#1437)

Co-authored-by: Martin Adámek <[email protected]>

Author: jancurn

sources/platform/actors/running/runs_and_builds.md

@@ -39,18 +39,18 @@ What's happening inside of an Actor is visible on the Actor run log in the Actor
 
 ### Origin
 
-All **Actor runs** have an **Origin** field indicating where the Actor run was invoked.
+Both **Actor runs** and **builds** have the **Origin** field indicating how the Actor run or build was invoked, respectively. The origin is displayed in Apify Console and available via [API](https://docs.apify.com/api/v2/actor-run-get) in the `meta.origin` field.
 
 |Name|Origin|
 |:---|:---|
-|DEVELOPMENT|Manually from Apify Console in Development mode (own Actor)|
-|WEB|Manually from Apify Console in "normal" mode (someone else's Actor or task)|
-|API|From API|
-|CLI|From Apify CLI|
-|SCHEDULER|Using a Schedule|
-|WEBHOOK|Using a webhook|
-|ACTOR|From another Actor run|
-|STANDBY|From Actor Standby|
+|`DEVELOPMENT`|Manually from Apify Console in the Development mode (own Actor)|
+|`WEB`|Manually from Apify Console in "normal" mode (someone else's Actor or task)|
+|`API`|From [Apify API](https://docs.apify.com/api)|
+|`CLI`|From [Apify CLI](https://docs.apify.com/cli/)|
+|`SCHEDULER`|Using a schedule|
+|`WEBHOOK`|Using a webhook|
+|`ACTOR`|From another Actor run|
+|`STANDBY`|From [Actor Standby](./standby)|
 
 ## Lifecycle