fix(docs): pin poetry to version used in CI

Pin poetry to version 1.3.2, which is currently used in CI, to ensure
that all builds are consistent. Also, fix typo in `doc` group name.

Change-Id: Id0c1aa88ac7ffcc241a51c693570e87abacf7ebc
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
(cherry picked from commit 5f0f3bf4084864e351598f94cf800a57374e2877)
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index f1785d8..e3a7ebf 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -17,10 +17,10 @@
     - plantuml
   jobs:
     post_create_environment:
-      - pip install poetry
+      - pip install poetry=="1.3.2"
       - poetry config virtualenvs.create false
     post_install:
-      - poetry install --with docs
+      - poetry install --with doc
 
 sphinx:
   configuration: docs/conf.py