docs: highlight npx in bash blocks and polish English copy

Use Prism insertBefore for CLI commands like npx, tighten tutorial and reference wording, and keep YAML titles free of backticks so sidebar and page headings stay correct.

Co-authored-by: Cursor <[email protected]>

docs/source/tutorials/security-model.md

@@ -28,7 +28,7 @@ A typical PC handles `1e8` (100M) characters without issues.
 
 ### renderLimit
 
-Restricting template size alone is insufficient because dynamic loops with large counts can occur in render time. [renderLimit][renderLimit] mitigates this by limiting the time consumed by each `render()` call.
+Restricting template size alone is insufficient because dynamic loops with large counts can occur during rendering. [renderLimit][renderLimit] mitigates this by limiting the time consumed by each `render()` call.
 
 ```liquid
 {%- for i in (1..10000000) -%}
@@ -49,7 +49,7 @@ Render time is checked on a per-template basis (before rendering each template).
 
 In other words, `memoryLimit` limits what LiquidJS counts, not every byte your process may allocate.
 
-Even with small number of templates and iterations, memory usage can grow exponentially. In the following example, memory doubles with each iteration:
+Even with a small number of templates and iterations, memory usage can grow exponentially. In the following example, memory doubles with each iteration:
 
 ```liquid
 {% assign array = "1,2,3" | split: "," %}