fixed up headings in canonical form notebook

Author: tclose

docs/source/tutorial/7-canonical-form.ipynb

@@ -28,7 +28,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Python-tasks\n",
+    "### Python-tasks\n",
     "\n",
     "Python tasks in dataclass form are decorated by `pydra.compose.python.define`\n",
     "with inputs listed as type annotations. Outputs are similarly defined in a nested class\n",
@@ -135,7 +135,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Shell-tasks\n",
+    "### Shell-tasks\n",
     "\n",
     "The canonical form of shell tasks is the same as for Python tasks, except a string `executable`\n",
     "attribute replaces the `function` staticmethod."
@@ -183,7 +183,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Workflow definitions\n",
+    "### Workflow definitions\n",
     "\n",
     "Workflows can also be defined in canonical form, which is the same as for Python tasks\n",
     "but with a staticmethod called `constructor` that constructs the workflow."
@@ -242,7 +242,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Converting to/from dictionaries\n",
+    "## Conversion to/from dictionaries\n",
     "\n",
     "As well as the dataclass-like canonical form, it is also possible to represent all tasks\n",
     "in a nested dictionary form, which could be written to a static file (e.g. in JSON or\n",