feat: make use of templating in docstring fragments

Author: ntamas

docs/fragments/_include/write_graph_outstream.txt

@@ -0,0 +1,3 @@
+    outstream: the output file or stream to write the graph to. May be a
+        filename, a path-like object or a file-like object if it is backed
+        by a low-level file handle

docs/fragments/igraph_write_graph_edgelist.txt

@@ -9,6 +9,4 @@ in the output file instead of IDs.
 
 Parameters:
     graph: the graph to write
-    outstream: the output file or stream to write the graph to. May be a
-        filename, a path-like object or a file-like object if it is backed
-        by a low-level file handle
+{% include '_include/write_graph_outstream.txt' %}

docs/fragments/igraph_write_graph_graphml.txt

@@ -4,9 +4,7 @@ The GraphML format preserves numeric, string and boolean attributes.
 
 Parameters:
     graph: the graph to write
-    outstream: the output file or stream to write the graph to. May be a
-        filename, a path-like object or a file-like object if it is backed
-        by a low-level file handle
+{% include '_include/write_graph_outstream.txt' %}
     prefixattr: whether to put a prefix in front of the attribute names to
         ensure uniqueness if the graph has vertex and edge (or graph)
         attributes with the same name

poetry.lock

@@ -15,7 +15,7 @@ pytest = "^7.2.1"
 pytest-cov = "^4.0.0"
 richbench = "^1.0.3"
 igraph = "^0.10.6"
-stimulus = { git = "https://github.com/igraph/stimulus.git", tag = "0.15.0" }
+stimulus = { git = "https://github.com/igraph/stimulus.git", tag = "0.16.0" }
 pytest-datadir = "^1.4.1"
 
 [tool.poetry.group.doc.dependencies]