conda-doctor: add page (#17789)

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/common/conda-doctor.md

@@ -0,0 +1,20 @@
+# conda doctor
+
+> Display a health report for your environment.
+> More information: <https://docs.conda.io/projects/conda/en/latest/commands/doctor.html>.
+
+- View report for the currently active environment:
+
+`conda doctor`
+
+- Specify an environment by name:
+
+`conda doctor {{[-n|--name]}} {{environment_name}}`
+
+- Specify an environment by its path:
+
+`conda doctor {{[-p|--prefix]}} {{path/to/environment}}`
+
+- Enable verbose output (Note: the `-v` flag can be repeated to increase verbosity):
+
+`conda doctor {{[-v|--verbose]}}`