Fix input field variable name (#483)

Use underscore instead of dash

pages/Hypr Ecosystem/hyprlock.md

@@ -61,7 +61,7 @@ input-field {
     inner_color = rgb(200, 200, 200)
     font_color = rgb(10, 10, 10)
     fade_on_empty = true
-    placeholder-text = <i>Input Password...</i> # Text rendered in the input box when it's empty.
+    placeholder_text = <i>Input Password...</i> # Text rendered in the input box when it's empty.
 
     position = 0, -20
     halign = center
@@ -89,4 +89,4 @@ label {
 
 Available variables for `text`:
  - `$USER` - username
- - `$TIME` - current time (e.g. `13:37`)
+ - `$TIME` - current time (e.g. `13:37`)