applied typos and spelling error fixes patch from Olly Betts

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15779 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/inputstr.tex

@@ -96,7 +96,7 @@ Returns the current stream position.
 \func{size\_t}{Ungetch}{\param{const char*}{ buffer}, \param{size\_t}{ size}}
 
 This function is only useful in {\it read} mode. It is the manager of the "Write-Back"
-buffer. This buffer acts like a temporary buffer where datas which has to be
+buffer. This buffer acts like a temporary buffer where data which has to be
 read during the next read IO call are put. This is useful when you get a big
 block of data which you didn't want to read: you can replace them at the top
 of the input queue by this way.