Add missing descriptions to TextServer's constants

doc/classes/TextServer.xml

@@ -1744,6 +1744,7 @@
  Vertical BGR subpixel layout.
  </constant>
  <constant name="FONT_LCD_SUBPIXEL_LAYOUT_MAX" value="5" enum="FontLCDSubpixelLayout">
+ Represents the size of the [enum FontLCDSubpixelLayout] enum.
  </constant>
  <constant name="DIRECTION_AUTO" value="0" enum="Direction">
  Text direction is determined based on contents and current locale.
@@ -1867,6 +1868,7 @@
  Determines whether the ellipsis at the end of the text is enforced and may not be hidden.
  </constant>
  <constant name="OVERRUN_JUSTIFICATION_AWARE" value="16" enum="TextOverrunFlag" is_bitfield="true">
+ Accounts for the text being justified before attempting to trim it (see [enum JustificationFlag]).
  </constant>
  <constant name="GRAPHEME_IS_VALID" value="1" enum="GraphemeFlag" is_bitfield="true">
  Grapheme is supported by the font, and can be drawn.
@@ -2005,6 +2007,7 @@
  Spacing at the bottom of the line.
  </constant>
  <constant name="SPACING_MAX" value="4" enum="SpacingType">
+ Represents the size of the [enum SpacingType] enum.
  </constant>
  <constant name="FONT_BOLD" value="1" enum="FontStyle" is_bitfield="true">
  Font is bold.