docs: Fix default value for fabricCapacityMode in documentation (#143)

* docs: fix incorrect fabricCapacityMode default from byo to create

Align docs with actual default in infra/main.bicepparam (line 231)
which uses 'create' not 'byo' as the fallback value.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: clarify default mode description in deployment guide

* docs: correct formatting of default mode description in deployment guide

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Harmanpreet-Microsoft

docs/deploymentguide.md

@@ -195,14 +195,14 @@ Edit `infra/main.bicepparam` or set environment variables:
 
 If you already have a Fabric capacity and workspace, set `byo` mode so the deployment skips creating new ones. The bicepparam variables are driven by environment variables, so the recommended approach is to set them with `azd env set` before running `azd up`:
 
-**Step 1 — Set the mode in `infra/main.bicepparam`** (or leave the default `byo` unchanged):
+**Step 1 — Set the mode** ( The default value is `create`, so override it to `byo`):
 
 ```bicep
 // infra/main.bicepparam
-var fabricCapacityPreset = readEnvironmentVariable('fabricCapacityMode', 'byo')
+var fabricCapacityPreset = readEnvironmentVariable('fabricCapacityMode', 'create')
 ```
 
-The `fabricCapacityMode` env variable controls both capacity and workspace preset (they are tied together). Set it explicitly if the checked-in default has been changed:
+The `fabricCapacityMode` env variable controls both capacity and workspace preset (they are tied together). Set it explicitly to use BYO mode:
 
 ```powershell
 azd env set fabricCapacityMode byo

docs/parameter_guide.md

@@ -32,8 +32,8 @@ The recommended way to configure Fabric mode is with `azd env set` — these val
 
 ```powershell
 # Choose one:
-azd env set fabricCapacityMode create   # create new capacity + workspace
-azd env set fabricCapacityMode byo      # reuse existing capacity + workspace (default)
+azd env set fabricCapacityMode create   # create new capacity + workspace (default if not set)
+azd env set fabricCapacityMode byo      # reuse existing capacity + workspace
 azd env set fabricCapacityMode none     # disable all Fabric automation
 ```