Make volume example strings uppercase
@@ -15,7 +15,7 @@ For example:
```toml
[build.env]
-volumes = ["vol1", "vol2"]
+volumes = ["VOL1_ARG", "VOL2_ARG"]
passthrough = ["IMPORTANT_ENV_VARIABLES"]
```
@@ -24,7 +24,7 @@ The `target` key allows you to specify parameters for specific compilation targe
```toml
[target.aarch64-unknown-linux-gnu]
-volumes = ["vol1", "vol2"]
+volumes = ["VOL1_ARG", "VOL2_ARG"]
passthrough = ["VAR1", "VAR2"]
xargo = false
image = "test-image"
