message: Update some stale docs
diff: @@ -285,12 +285,6 @@ public:
  /// or one that was not attached using attach_file(). Doing so
  /// will result in undefined behavior.
  ///
  - /// The file_size argument must be aligned to a *section* boundary:
  - /// The database file is logically split into sections, each section
  - /// guaranteed to be mapped as a contiguous address range. The allocation
  - /// of memory in the file must ensure that no allocation crosses the
  - /// boundary between two sections.
  - ///
  /// Updates the memory mappings to reflect a new size for the file.
  /// Stale mappings are retained so that they remain valid for other threads,
  /// which haven't yet seen the file size change. The stale mappings are
  @@ -305,8 +299,8 @@ public:
  /// Get an ID for the current mapping version. This ID changes whenever any part
  /// of an existing mapping is changed. Such a change requires all refs to be
  - /// retranslated to new pointers. The allocator tries to avoid this, and we
  - /// believe it will only ever occur on Windows based platforms.
  + /// retranslated to new pointers. This will happen whenever the reader view
  + /// is extended unless the old size was aligned to a section boundary.
  uint64_t get_mapping_version()
  {
  return m_mapping_version;
  