docs: replace duplicate Expression docs with a link (#11744)

Signed-off-by: Anton Gilgur <[email protected]>
(cherry picked from commit d654dc0)

docs/conditional-artifacts-parameters.md

@@ -2,10 +2,8 @@
 
 > v3.1 and after
 
-The Conditional Artifacts and Parameters feature enables to assign the Step/DAG level artifacts or parameters based on
-expression. This introduces a new field `fromExpression: ...` under Step/DAG level output artifact and `expression: ...`
-under step/DAG level output parameter. Both use the
-[expr](https://github.com/antonmedv/expr/blob/master/docs/Language-Definition.md) syntax.
+You can set Step/DAG level artifacts or parameters based on an [expression](variables.md#expression).
+Use `fromExpression` under a Step/DAG level output artifact and `expression` under a Step/DAG level output parameter.
 
 ## Conditional Artifacts
 
@@ -51,22 +49,6 @@ under step/DAG level output parameter. Both use the
               expression: "steps['flip-coin'].outputs.result == 'heads' ? steps.heads.outputs.result : steps.tails.outputs.result"
 ```
 
-## Built-In Functions
-
-Convenient functions added to support more use cases:
-
-1. `asInt`    - convert the string to integer (e.g: `asInt('1')`)
-2. `asFloat`  - convert the string to Float (e.g: `asFloat('1.23')`)
-3. `string`   - convert the int/float to string (e.g: `string(1)`)
-4. `jsonpath` - Extract the element from JSON using JSON Path (
-   e.g: `jsonpath('{"employee":{"name":"sonoo","salary":56000,"married":true}}", "$.employee.name" )` )
-5. [Sprig](http://masterminds.github.io/sprig/) - Support all `sprig` functions
-
-!!! NOTE
-    Expressions will decode the `-` as operator if template name has `-`, it will fail the expression. So here solution
-    for template name which has `-` in its name. `step['one-two-three'].outputs.artifacts`
-
 * [Steps parameter example](https://raw.githubusercontent.com/argoproj/argo-workflows/main/examples/conditional-parameters.yaml)
 * [DAG parameter example](https://raw.githubusercontent.com/argoproj/argo-workflows/main/examples/dag-conditional-parameters.yaml)
 * [Advanced example: fibonacci Sequence](https://raw.githubusercontent.com/argoproj/argo-workflows/main/examples/fibonacci-seq-conditional-param.yaml)
-