AlgorithmDescription.md: using a single # in TOC links

this matches the anchors produced under gitiles.

Change-Id: Ic5387029df0e7742cef8ee78e2108af22884c136
diff --git a/doc/AlgorithmDescription.md b/doc/AlgorithmDescription.md
index 799f2c7..bfd64da 100644
--- a/doc/AlgorithmDescription.md
+++ b/doc/AlgorithmDescription.md
@@ -13,34 +13,34 @@
 
 [Algorithm description](#Algorithm-Description)
 
-- [Block Partitioning](##Block-Partitioning)
-  - [Coding block partition](###Coding-block-partition)
-  - [Transform block partition](###Transform-block-partition)
-- [Intra Prediction](##Intra-Prediction)
-  - [Directional intra prediction modes](###Directional-intra-prediction-modes)
-  - [Non-directional intra prediction modes](###Non-directional-intra-prediction-modes)
-  - [Recursive filtering modes](###Recursive-filtering-modes)
-  - [Chroma from Luma mode](###Chroma-from-Luma-mode)
-- [Inter Prediction](##Inter-Prediction)
-  - [Motion vector prediction](###Motion-vector-prediction)
-  - [Motion vector coding](###Motion-vector-coding)
-  - [Interpolation filter for motion compensation](###Interpolation-filter-for-motion-compensation)
-  - [Warped motion compensation](###Warped-motion-compensation)
-  - [Overlapped block motion compensation](###Overlapped-block-motion-compensation)
-  - [Reference frames](###Reference-frames)
-  - [Compound Prediction](###Compound-Prediction)
-- [Transform](##Transform)
-- [Quantization](##Quantization)
-- [Entropy Coding](##Entropy-Coding)
-- [Loop filtering and post-processing](##Loop-filtering-and-post-processing)
-  - [Deblocking](###Deblocking)
-  - [Constrained directional enhancement](###Constrained-directional-enhancement)
-  - [Loop Restoration filter](###Loop-Restoration-filter)
-  - [Frame super-resolution](###Frame-super-resolution)
-  - [Film grain synthesis](###Film-grain-synthesis)
-- [Screen content coding](##Screen-content-coding)
-  - [Intra block copy](###Intra-block-copy)
-  - [Palette mode](###Palette-mode)
+- [Block Partitioning](#Block-Partitioning)
+  - [Coding block partition](#Coding-block-partition)
+  - [Transform block partition](#Transform-block-partition)
+- [Intra Prediction](#Intra-Prediction)
+  - [Directional intra prediction modes](#Directional-intra-prediction-modes)
+  - [Non-directional intra prediction modes](#Non-directional-intra-prediction-modes)
+  - [Recursive filtering modes](#Recursive-filtering-modes)
+  - [Chroma from Luma mode](#Chroma-from-Luma-mode)
+- [Inter Prediction](#Inter-Prediction)
+  - [Motion vector prediction](#Motion-vector-prediction)
+  - [Motion vector coding](#Motion-vector-coding)
+  - [Interpolation filter for motion compensation](#Interpolation-filter-for-motion-compensation)
+  - [Warped motion compensation](#Warped-motion-compensation)
+  - [Overlapped block motion compensation](#Overlapped-block-motion-compensation)
+  - [Reference frames](#Reference-frames)
+  - [Compound Prediction](#Compound-Prediction)
+- [Transform](#Transform)
+- [Quantization](#Quantization)
+- [Entropy Coding](#Entropy-Coding)
+- [Loop filtering and post-processing](#Loop-filtering-and-post-processing)
+  - [Deblocking](#Deblocking)
+  - [Constrained directional enhancement](#Constrained-directional-enhancement)
+  - [Loop Restoration filter](#Loop-Restoration-filter)
+  - [Frame super-resolution](#Frame-super-resolution)
+  - [Film grain synthesis](#Film-grain-synthesis)
+- [Screen content coding](#Screen-content-coding)
+  - [Intra block copy](#Intra-block-copy)
+  - [Palette mode](#Palette-mode)
 
 [References](#References)