docs/install.md: minor tweaks

Signed-off-by: Valentin Rothberg <[email protected]>

docs/install.md

@@ -47,7 +47,7 @@ other options.
 Here's an example:
 
 ```
-$ podman run --privileged --pid=host --net=none --security-opt label=type:unconfined_t <image> bootc install --target-no-signature-verification /path/to/disk
+$ podman run --privileged --pid=host --net=none -v /path/to/disk:/target-root --security-opt label=type:unconfined_t <image> bootc install --target-no-signature-verification /target-root
 ```
 
 Note that while `--privileged` is used, this command will not
@@ -62,6 +62,9 @@ an installation by default is not fetching anything else external
 from the network - the content to be installed
 *is the running container image content*.
 
+The `-v /path/to/disk:/target-root` is the target block device to install
+`<image>` to.
+
 ### Operating system install configuration required
 
 The container image must define its default install configuration.  For example,
@@ -121,7 +124,7 @@ in the image - it is per machine state.
 
 #### Injecting SSH keys in a container image
 
-In this example, we will configure OpenSSH to read the
+In the following example, we will configure OpenSSH to read the
 set of authorized keys for the root user from content
 that lives in `/usr` (i.e. is owned by the container image).
 We will also create a `/usr/etc-system` directory which is intentionally distinct