bpo-31569: correct PCBuild/ case to PCbuild/ in build scripts and docs (GH-3711)

diff --git a/Doc/distutils/builtdist.rst b/Doc/distutils/builtdist.rst
index dc3a50c..f523a67 100644
--- a/Doc/distutils/builtdist.rst
+++ b/Doc/distutils/builtdist.rst
@@ -368,7 +368,7 @@
 binary installation of Python (as the .lib etc file for other platforms are
 not included.)  In practice, this means the user of a 32 bit operating
 system will need to use Visual Studio 2008 to open the
-:file:`PCBuild/PCbuild.sln` solution in the Python source tree and build the
+:file:`PCbuild/PCbuild.sln` solution in the Python source tree and build the
 "x64" configuration of the 'pythoncore' project before cross-compiling
 extensions is possible.
 
diff --git a/Doc/library/test.rst b/Doc/library/test.rst
index 9d4ff7a..33978e3 100644
--- a/Doc/library/test.rst
+++ b/Doc/library/test.rst
@@ -186,7 +186,7 @@
 Some other ways to execute the regression tests depend on what platform the
 tests are being executed on. On Unix, you can run :program:`make test` at the
 top-level directory where Python was built. On Windows,
-executing :program:`rt.bat` from your :file:`PCBuild` directory will run all
+executing :program:`rt.bat` from your :file:`PCbuild` directory will run all
 regression tests.
 
 
diff --git a/Doc/make.bat b/Doc/make.bat
index 6cb315f..3f201de 100644
--- a/Doc/make.bat
+++ b/Doc/make.bat
@@ -5,7 +5,7 @@
 
 set this=%~n0
 
-call ..\PCBuild\find_python.bat %PYTHON%
+call ..\PCbuild\find_python.bat %PYTHON%
 if not defined SPHINXBUILD if defined PYTHON (
     %PYTHON% -c "import sphinx" > nul 2> nul
     if errorlevel 1 (