docs: use single backslashes in Windows examples

Author: RbBtSn0w

TESTING.md

@@ -36,15 +36,15 @@ Windows (PowerShell):
 ```powershell
 cd <spec-kit-repo>
 uv sync --extra test
-.\\.venv\\Scripts\\Activate.ps1
+.\.venv\Scripts\Activate.ps1
 ```
 
 Windows (CMD):
 
 ```bat
 cd <spec-kit-repo>
 uv sync --extra test
-.venv\\Scripts\\activate
+.venv\Scripts\activate
 ```
 
 ### Generated package structure and content
@@ -98,7 +98,7 @@ Windows (PowerShell):
 # Install the project and test dependencies from your local branch
 cd <spec-kit-repo>
 uv sync --extra test
-.\\.venv\\Scripts\\Activate.ps1
+.\.venv\Scripts\Activate.ps1
 uv pip install -e .
 # Ensure the `specify` binary in this environment points at your working tree so the agent runs the branch you're testing.
 ```
@@ -109,15 +109,15 @@ Windows (CMD):
 # Install the project and test dependencies from your local branch
 cd <spec-kit-repo>
 uv sync --extra test
-.venv\\Scripts\\activate
+.venv\Scripts\activate
 uv pip install -e .
 # Ensure the `specify` binary in this environment points at your working tree so the agent runs the branch you're testing.
 ```
 
 Then initialize a test project using your local changes:
 
 ```bash
-# Choose a test project directory, e.g. /tmp/speckit-test (Unix) or %TEMP%\\speckit-test / $env:TEMP\\speckit-test (Windows)
+# Choose a test project directory, e.g. /tmp/speckit-test (Unix) or %TEMP%\speckit-test / $env:TEMP\speckit-test (Windows)
 uv run specify init <test-project-dir> --ai <agent> --offline
 cd <test-project-dir>