chore(docs): User (Human) naming consistency (#11512)

# Which Problems Are Solved

Naming inconsistencies - User (Human)

# How the Problems Are Solved

Most of the occurrences have not been changed. `User (Human)` was mostly
changed when talking about code objects and where I felt it was
necessary to distinguish them from machine users.

When both human and machine user occurrences were found, the machine
user has been changed to service account (see
https://github.com/zitadel/zitadel/issues/11285)

# Additional Context

- Closes #11284

---------

Co-authored-by: Wim Van Laer <[email protected]>

apps/docs/content/apis/actions/external-authentication.mdx

@@ -77,7 +77,7 @@ The trigger is represented by the following Ids in the API: `TRIGGER_TYPE_PRE_CR
 - `ctx`
   The first parameter contains the following fields
   - `v1`
-    - `user` [*human*](./objects#human-user)
+    - `user` [*(human)*](./objects#human-user)
     - `authRequest` [*auth request*](/apis/actions/objects#auth-request)
     - `httpRequest` [*http request*](/apis/actions/objects#http-request)
     - `org`

apps/docs/content/apis/actions/objects.mdx

@@ -63,8 +63,8 @@ title: Objects
 - `username` *string*
 - `loginNames` Array of *string*
 - `preferredLoginName` *string*
-- `human`
-  Set if the user is human
+- `human`  
+  Set if User (Human)
   - `firstName` *string*
   - `lastName` *string*
   - `nickName` *string*