[doc] Fix underscore with hyphen for install-dir
get-toolchain.py uses `install-dir` instead of `install_dir`.
Signed-off-by: Canberk Topal <ctopal@lowrisc.org>
diff --git a/doc/getting_started/_index.md b/doc/getting_started/_index.md
index 1fbee45..ab4e599 100644
--- a/doc/getting_started/_index.md
+++ b/doc/getting_started/_index.md
@@ -106,7 +106,7 @@
Assuming one of the above worked and you have installed to a non-standard location, you will need to set the `TOOLCHAIN_PATH` environment variable to match whatever path you used.
For example, if I wanted to install to `~/ot_tools/riscv`, then I would use:
```console
-$ ./util/get-toolchain.py --install_dir=~/ot_tools/riscv
+$ ./util/get-toolchain.py --install-dir=~/ot_tools/riscv
$ export TOOLCHAIN_PATH=~/ot_tools/riscv
```
Add the `export` command to your `~/.bashrc` or equivalent to ensure that the `TOOLCHAIN_PATH` variable is set for future sessions.
