Update index.rst (#4029)

Add alt text to logo image Co-authored-by: James Lamb <[email protected]>
microsoft · Mar 10, 2021 · b75a43a · b75a43a
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commit b75a43a
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diff --git a/docs/index.rst b/docs/index.rst
@@ -6,6 +6,7 @@
 .. image:: ./logo/LightGBM_logo_black_text.svg
    :align: center
    :width: 600
+   :alt: Light Gradient Boosting Machine logo.
 
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