Docs: Remove nbsp characters

Replace nbsp characters with regular space characters for consistency.

Change-Id: I13848388f9c6055cf97e4a335cb1baaa4d9449f8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/80080
Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com>
Reviewed-by: Rob Mohr <mohrr@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/docs/python_build.rst b/docs/python_build.rst
index f260fe5..d032613 100644
--- a/docs/python_build.rst
+++ b/docs/python_build.rst
@@ -181,19 +181,19 @@
 
   module_name/
   ├── py/
-  │   ├── BUILD.gn
-  │   ├── setup.cfg
-  │   ├── setup.py
-  │   ├── pyproject.toml
-  │   ├── package_name/
-  │   │   ├── module_a.py
-  │   │   ├── module_b.py
-  │   │   ├── py.typed
-  │   │   └── nested_package/
-  │   │       ├── py.typed
-  │   │       └── module_c.py
-  │   ├── module_a_test.py
-  │   └── module_c_test.py
+  │   ├── BUILD.gn
+  │   ├── setup.cfg
+  │   ├── setup.py
+  │   ├── pyproject.toml
+  │   ├── package_name/
+  │   │   ├── module_a.py
+  │   │   ├── module_b.py
+  │   │   ├── py.typed
+  │   │   └── nested_package/
+  │   │       ├── py.typed
+  │   │       └── module_c.py
+  │   ├── module_a_test.py
+  │   └── module_c_test.py
   └── ...
 
 The ``BUILD.gn`` declares this package in GN. For upstream Pigweed, a presubmit
diff --git a/pw_build/docs.rst b/pw_build/docs.rst
index ff95b5a..d0c6628 100644
--- a/pw_build/docs.rst
+++ b/pw_build/docs.rst
@@ -462,11 +462,11 @@
 
   foo.zip
   ├── bar/
-  │   ├── file3.txt
-  │   └── some_dir/
-  │       ├── file4.txt
-  │       └── some_other_dir/
-  │           └── file5.txt
+  │   ├── file3.txt
+  │   └── some_dir/
+  │       ├── file4.txt
+  │       └── some_other_dir/
+  │           └── file5.txt
   ├── file1.txt
   └── renamed.txt
 
diff --git a/pw_build/zip.gni b/pw_build/zip.gni
index b6eb568..04d79e9 100644
--- a/pw_build/zip.gni
+++ b/pw_build/zip.gni
@@ -79,11 +79,11 @@
 #
 #     foo.zip
 #     ├── bar/
-#     │   ├── file3.txt
-#     │   └── some_dir/
-#     │       ├── file4.txt
-#     │       └── some_other_dir/
-#     │           └── file5.txt
+#     │   ├── file3.txt
+#     │   └── some_dir/
+#     │       ├── file4.txt
+#     │       └── some_other_dir/
+#     │           └── file5.txt
 #     ├── file1.txt
 #     └── renamed.txt
 #