[Canvas][Docs] Adds var and var_set to expression function reference (#74291) (#75832)

docs/canvas/canvas-function-reference.asciidoc

@@ -13,7 +13,7 @@ A *** denotes a required argument.
 
 A † denotes an argument can be passed multiple times.
 
-<<a_fns>> | B | <<c_fns>> | <<d_fns>> | <<e_fns>> | <<f_fns>> | <<g_fns>> | <<h_fns>> | <<i_fns>> | <<j_fns>> | K | <<l_fns>> | <<m_fns>> | <<n_fns>> | O | <<p_fns>> | Q | <<r_fns>> | <<s_fns>> | <<t_fns>> | <<u_fns>> | V | W | X | Y | Z
+<<a_fns>> | B | <<c_fns>> | <<d_fns>> | <<e_fns>> | <<f_fns>> | <<g_fns>> | <<h_fns>> | <<i_fns>> | <<j_fns>> | K | <<l_fns>> | <<m_fns>> | <<n_fns>> | O | <<p_fns>> | Q | <<r_fns>> | <<s_fns>> | <<t_fns>> | <<u_fns>> | <<v_fns>> | W | X | Y | Z
 
 [float]
 [[a_fns]]
@@ -2871,3 +2871,56 @@ Default: `""`
 |===
 
 *Returns:* `string`
+
+[float]
+[[v_fns]]
+== V
+
+[float]
+[[var_fn]]
+=== `var`
+
+Updates the Kibana global context.
+
+*Accepts:* `any`
+
+[cols="3*^<"]
+|===
+|Argument |Type |Description
+
+|_Unnamed_ ***
+
+Alias: `name`
+|`string`
+|Specify the name of the variable.
+|===
+
+*Returns:* Depends on your input and arguments
+
+
+[float]
+[[var_set_fn]]
+=== `var_set`
+
+Updates the Kibana global context.
+
+*Accepts:* `any`
+
+[cols="3*^<"]
+|===
+|Argument |Type |Description
+
+|_Unnamed_ ***
+
+Alias: `name`
+|`string`
+|Specify the name of the variable.
+
+|`value`
+
+Alias: `val`
+|`any`
+|Specify the value for the variable. When unspecified, the input context is used.
+|===
+
+*Returns:* Depends on your input and arguments

src/plugins/expressions/common/expression_functions/specs/var.ts

@@ -34,7 +34,7 @@ export type ExpressionFunctionVar = ExpressionFunctionDefinition<
 export const variable: ExpressionFunctionVar = {
   name: 'var',
   help: i18n.translate('expressions.functions.var.help', {
-    defaultMessage: 'Updates kibana global context',
+    defaultMessage: 'Updates the Kibana global context.',
   }),
   args: {
     name: {
@@ -42,7 +42,7 @@ export const variable: ExpressionFunctionVar = {
       aliases: ['_'],
       required: true,
       help: i18n.translate('expressions.functions.var.name.help', {
-        defaultMessage: 'Specify name of the variable',
+        defaultMessage: 'Specify the name of the variable.',
       }),
     },
   },

src/plugins/expressions/common/expression_functions/specs/var_set.ts

@@ -35,7 +35,7 @@ export type ExpressionFunctionVarSet = ExpressionFunctionDefinition<
 export const variableSet: ExpressionFunctionVarSet = {
   name: 'var_set',
   help: i18n.translate('expressions.functions.varset.help', {
-    defaultMessage: 'Updates kibana global context',
+    defaultMessage: 'Updates the Kibana global context.',
   }),
   args: {
     name: {
@@ -43,14 +43,14 @@ export const variableSet: ExpressionFunctionVarSet = {
       aliases: ['_'],
       required: true,
       help: i18n.translate('expressions.functions.varset.name.help', {
-        defaultMessage: 'Specify name of the variable',
+        defaultMessage: 'Specify the name of the variable.',
       }),
     },
     value: {
       aliases: ['val'],
       help: i18n.translate('expressions.functions.varset.val.help', {
         defaultMessage:
-          'Specify value for the variable. If not provided input context will be used',
+          'Specify the value for the variable. When unspecified, the input context is used.',
       }),
     },
   },