typo in tutorials on r505

There are typos in tutorials as follows:

*Basic
#: tutorial-basic.xml:380(para)
msgid ""
"Chances are, your copies of the square are placed more or less randomly. This "
"is where the Align dialog (<keycap>Shift+Ctrl+A</keycap>) is useful. Select "
"all the squares (<keycap>Shift+click</keycap> or drag a rubberband), open the "
"dialog and press the “Center on horizontal axis” button, then the “Make "
"horizontal gaps between objects equal” button (read the button tooltips). The "
"objects are now neatly aligned and distributed equispacedly. Here are some "
"other alignment and distribution examples:"

s/Align dialog/Align and Distribute dialog/

*Tips
#: tutorial-tips.xml:183(para)
msgid ""
"In the default template, the unit of measure used by the rulers is px (“SVG "
"user unit”, in Inkscape it's equal to 0.8pt or 1/90 of the inch). This is "
"also the unit used in displaying coordinates at the lower-left corner and "
"preselected in all units menus. (You can always hover your mouse over a ruler "
"to see the tooltip with the units it uses.) To change this, open "
"<command>Document Preferences</command> (<keycap>Shift+Ctrl+D</keycap>) and "
"change the <command>Default units</command> on the <command>Page</command> "
"tab."

s/Document Preferences/Document Properties/

Version:
inkscape-docs-r505