fish: refresh page (#7987)

* Refresh a page:
- better grammar
- better token syntax

* Add reading commands from stdin sample

pages/common/fish.md

@@ -11,18 +11,22 @@
 
 `fish --no-config`
 
-- Execute a command:
+- Execute specific commands:
 
-`fish --command "{{command}}"`
+`fish --command "{{echo 'fish is executed'}}"`
 
-- Execute a script:
+- Execute a specific script:
 
 `fish {{path/to/script.fish}}`
 
-- Check a script for syntax errors:
+- Check a specific script for syntax errors:
 
 `fish --no-execute {{path/to/script.fish}}`
 
+- Execute specific commands from stdin:
+
+`{{echo "echo 'fish is executed'"}} | fish`
+
 - Start an interactive shell session in private mode, where the shell does not access old history or save new history:
 
 `fish --private`
@@ -30,7 +34,3 @@
 - Define and export an environmental variable that persists across shell restarts (builtin):
 
 `set --universal --export {{variable_name}} {{variable_value}}`
-
-- Print the version:
-
-`fish --version`