Update conda build command in documentation

Use 'conda-build' instead of 'conda build' in quick start guide
for consistency with GitHub workflows.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: antonwolfy

doc/quick_start_guide.rst

@@ -74,7 +74,7 @@ And to build dpnp package from the sources:
 
 .. code-block:: bash
 
-    conda build conda-recipe -c https://software.repos.intel.com/python/conda/ -c conda-forge --override-channels
+    conda-build conda-recipe -c https://software.repos.intel.com/python/conda/ -c conda-forge --override-channels
 
 Finally, to install the result package: