Make titles in RAG gallery examples more explicit (#7202)

* Update titles in RAG gallery examples * Fix alignment of title marks with text --------- Co-authored-by: Juan Nunez-Iglesias <jni@fastmail.com>
scikit-image · Oct 13, 2023 · d6ba6db · d6ba6db
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diff --git a/doc/examples/segmentation/plot_rag.py b/doc/examples/segmentation/plot_rag.py
@@ -1,7 +1,7 @@
 """
-=======================
-Region Adjacency Graphs
-=======================
+==============================
+Region Adjacency Graphs (RAGs)
+==============================
 
 This example demonstrates the use of the `merge_nodes` function of a Region
 Adjacency Graph (RAG). The `RAG` class represents a undirected weighted graph

diff --git a/doc/examples/segmentation/plot_rag_boundary.py b/doc/examples/segmentation/plot_rag_boundary.py
@@ -1,7 +1,7 @@
 """
-==========================
-Region Boundary based RAGs
-==========================
+====================================================
+Region Boundary based Region adjacency graphs (RAGs)
+====================================================
 
 Construct a region boundary RAG with the ``rag_boundary`` function. The
 function  :py:func:`skimage.graph.rag_boundary` takes an

diff --git a/doc/examples/segmentation/plot_rag_mean_color.py b/doc/examples/segmentation/plot_rag_mean_color.py
@@ -1,7 +1,7 @@
 """
-================
-RAG Thresholding
-================
+=========================================
+Region adjacency graph (RAG) Thresholding
+=========================================
 
 This example constructs a Region Adjacency Graph (RAG) and merges regions
 which are similar in color. We construct a RAG and define edges as the

diff --git a/doc/examples/segmentation/plot_rag_merge.py b/doc/examples/segmentation/plot_rag_merge.py
@@ -1,7 +1,7 @@
 """
-===========
-RAG Merging
-===========
+====================================
+Region adjacency graph (RAG) Merging
+====================================
 
 This example constructs a Region Adjacency Graph (RAG) and progressively merges
 regions that are similar in color. Merging two adjacent regions produces