Fix a typo and fix section naming in docs

docs/source/index.rst

@@ -94,7 +94,7 @@ for your operating system for further details.
    :maxdepth: 2
    :caption: Under the Hood
 
-   tech_technical
+   tech_storage
 
 
 Indices and Tables

docs/source/tech_storage.rst

@@ -7,8 +7,8 @@ How Data is Stored
 This section contains details of how novelWriter stores and handles the project data.
 
 
-How Project Data is Stored
-==========================
+Project Structure
+=================
 
 All novelWriter files are written with utf-8 encoding. Since Python automatically converts Unix
 line endings to Windows line endings on Windows systems, novelWriter does not make any adaptations
@@ -41,7 +41,7 @@ meta data entries incremented, on each save.
 
 
 Project Documents
------------------
+=================
 
 All the project documents are saved in a folder in the main project folder named ``content``. Each
 document has a file handle taken from the first 13 characters of a SHA256 hash of the system time

docs/source/usage_format.rst

@@ -167,8 +167,8 @@ also be inserted at the cursor position in the editor via the :guilabel:`Insert`
 
 .. _a_fmt_align:
 
-Paragraphs Alignment and Indentation
-====================================
+Paragraph Alignment and Indentation
+===================================
 
 All documents have the text by default aligned to the left or justified, depending on your
 Preferences.