[Doc]: fix a syntax bug in "include_dir" docs

Signed-off-by: Seyed Alireza Damghani <[email protected]>

Author: sdamghan

doc/src/vtr/tasks.rst

@@ -144,15 +144,15 @@ Optional Fields
 
     Absolute path or relative to ``$VTR_ROOT/vtr_flow/``.
 
-    Note: Multiple _includes_dir_ are NOT allowed in a task config file.
+    Note: Multiple `includes_dir` are NOT allowed in a task config file.
 
-* **include_list_add**: A path to an _include_ file, which is relative to _includes_dir_
+* **include_list_add**: A path to an `include` file, which is relative to `includes_dir`
 
-    Multiple _include_list_add_ can be provided.
+    Multiple `include_list_add` can be provided.
 
-    _include_ files could act as the top module complementary, like definitions, macros or sub-modules.
+    `include` files could act as the top module complementary, like definitions, macros or sub-modules.
 
-    Note: _include_ files will be shared among all benchmark circuits in the task config file. 
+    Note: `include` files will be shared among all benchmark circuits in the task config file. 
 
 * **pass_requirements_file**: :ref:`vtr_pass_requirements` file.