Fixed some minor spelling errors.

diff --git a/doc/tutorial/ginac.texi b/doc/tutorial/ginac.texi
index 1577982d56e263461fe568c44dc720be66680914..45a14e614de271944b57d33948942e12707b6348 100644 (file)
--- a/doc/tutorial/ginac.texi
+++ b/doc/tutorial/ginac.texi
@@ -8213,15 +8213,15 @@ That's it. May the source be with you!
 
 @subsection Upgrading extension classes from older version of GiNaC
 
 
 @subsection Upgrading extension classes from older version of GiNaC
 

-GiNaC used to use custom run time type information system (RTTI). It was
-removed from GiNaC. Thus, one need to rewrite constructors which set
+GiNaC used to use a custom run time type information system (RTTI). It was
+removed from GiNaC. Thus, one needs to rewrite constructors which set

 @code{tinfo_key} (which does not exist any more). For example,
 
 @example
 myclass::myclass() : inherited(&myclass::tinfo_static) @{@}
 @end example
 
 @code{tinfo_key} (which does not exist any more). For example,
 
 @example
 myclass::myclass() : inherited(&myclass::tinfo_static) @{@}
 @end example
 

-need to be rewritten as
+needs to be rewritten as

 
 @example
 myclass::myclass() @{@}
 
 @example
 myclass::myclass() @{@}