MINOR: [C++][Parquet] Fix *_write_page_index and set_size_statistics_level comments (#48299)

### Rationale for this change

Defaults were changed in this commit 1fcc892

### What changes are included in this PR?

Fixed comments about default values of some writer properties

### Are these changes tested?

No need to test

### Are there any user-facing changes?

No

Lead-authored-by: chegoryu <[email protected]>
Co-authored-by: Egor Chunaev <[email protected]>
Signed-off-by: Gang Wu <[email protected]>

Author: chegoryu

cpp/src/parquet/properties.h

@@ -700,7 +700,7 @@ class PARQUET_EXPORT WriterProperties {
       return this;
     }
 
-    /// Enable writing page index in general for all columns. Default disabled.
+    /// Enable writing page index in general for all columns. Default enabled.
     ///
     /// Writing statistics to the page index disables the old method of writing
     /// statistics to each data page header.
@@ -715,35 +715,36 @@ class PARQUET_EXPORT WriterProperties {
       return this;
     }
 
-    /// Disable writing page index in general for all columns. Default disabled.
+    /// Disable writing page index in general for all columns. Default enabled.
     Builder* disable_write_page_index() {
       default_column_properties_.set_page_index_enabled(false);
       return this;
     }
 
-    /// Enable writing page index for column specified by `path`. Default disabled.
+    /// Enable writing page index for column specified by `path`. Default enabled.
     Builder* enable_write_page_index(const std::string& path) {
       page_index_enabled_[path] = true;
       return this;
     }
 
-    /// Enable writing page index for column specified by `path`. Default disabled.
+    /// Enable writing page index for column specified by `path`. Default enabled.
     Builder* enable_write_page_index(const std::shared_ptr<schema::ColumnPath>& path) {
       return this->enable_write_page_index(path->ToDotString());
     }
 
-    /// Disable writing page index for column specified by `path`. Default disabled.
+    /// Disable writing page index for column specified by `path`. Default enabled.
     Builder* disable_write_page_index(const std::string& path) {
       page_index_enabled_[path] = false;
       return this;
     }
 
-    /// Disable writing page index for column specified by `path`. Default disabled.
+    /// Disable writing page index for column specified by `path`. Default enabled.
     Builder* disable_write_page_index(const std::shared_ptr<schema::ColumnPath>& path) {
       return this->disable_write_page_index(path->ToDotString());
     }
 
-    /// \brief Set the level to write size statistics for all columns. Default is None.
+    /// \brief Set the level to write size statistics for all columns. Default is
+    /// PageAndColumnChunk.
     ///
     /// \param level The level to write size statistics. Note that if page index is not
     /// enabled, page level size statistics will not be written even if the level