DOC: Add conda uninstall pandas to contributing guide (#25490)

* fix #25487 add modify documentation
pandas-dev · Mar 3, 2019 · bd49d2f · bd49d2f
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commit bd49d2f
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diff --git a/doc/source/development/contributing.rst b/doc/source/development/contributing.rst
@@ -178,6 +178,7 @@ We'll now kick off a three-step process:
    # Create and activate the build environment
    conda env create -f environment.yml
    conda activate pandas-dev
+   conda uninstall --force pandas
 
    # or with older versions of Anaconda:
    source activate pandas-dev