docs: typo (fixes #1374)

Signed-off-by: Yukai Chou <[email protected]>

doc/generic/pgf/pgfmanual-en-tikz-scopes.tex

@@ -117,7 +117,7 @@ \subsubsection{Creating a Picture Using an Environment}
         |\tikz\draw(0,0)circle(.5ex);|, \pgfname\ will find out that the lower
         end of the picture is at $-.5\mathrm{ex} - 0.2\mathrm{pt}$ (the 0.2pt
         are half the line width, which is 0.4pt) and that the upper end is at
-        $.5\mathrm{ex}+.5\mathrm{pt}$. Then, the lower end will be put on the
+        $.5\mathrm{ex}+.2\mathrm{pt}$. Then, the lower end will be put on the
         baseline, resulting in the following: \tikz\draw(0,0)circle(.5ex);.
 
         Using this option, you can specify that the picture should be raised or