patch tilt MD doc for diagram correction

Tilt wraps `meepctl` commands. When you save a file, Tilt detects the change and runs the appropriate pipeline:

```

┌──────────────────────┐     ┌──────────────────────┐     ┌──────────────────────┐

│   You save a file    │────▶│   Tilt detects it     │────▶│  Runs meepctl cmds   │

│                      │     │                       │     │                      │

│  go-apps/meep-iot/   │     │  Matches: meep-iot    │     │  build + dockerize   │

│  server.go           │     │  resource :code       │     │  + rollout restart   │

└──────────────────────┘     └──────────────────────┘     └──────────────────────┘

```mermaid

flowchart LR

    A["You save a file<br/>go-apps/meep-iot/server.go"]

    B["Tilt detects it<br/>Matches: meep-iot<br/>resource :code"]

    C["Runs meepctl cmds<br/>build + dockerize<br/>+ rollout restart"]

    A --> B --> C

```

### What Tilt does vs. what you had to do manually