[PPAPI] Fix a bunch of spelling mistakes

ppapi/api/dev/ppb_text_input_dev.idl

Index: ppapi/api/dev/ppb_text_input_dev.idl
diff --git a/ppapi/api/dev/ppb_text_input_dev.idl b/ppapi/api/dev/ppb_text_input_dev.idl
index d8c417613259442da1dd7e88fbc6730ed9fe3fa2..27704b089ec5b28ab939077ff844aba32c183581 100644
--- a/ppapi/api/dev/ppb_text_input_dev.idl
+++ b/ppapi/api/dev/ppb_text_input_dev.idl
@@ -73,16 +73,16 @@ interface PPB_TextInput_Dev {
    * call, informs the browser about the current text selection and surrounding
    * text. <code>text</code> is a UTF-8 string that contains the current range
    * of text selection in the plugin. <code>caret</code> is the byte-index of
-   * the caret poisition within <code>text</code>. <code>anchor</code> is the
+   * the caret position within <code>text</code>. <code>anchor</code> is the
    * byte-index of the anchor position (i.e., if a range of text is selected,
-   * it is the other edge of selection diffrent from <code>caret</code>. If
+   * it is the other edge of selection different from <code>caret</code>. If
    * there are no selection, <code>anchor</code> is equal to <code>caret</code>.
    *
    * Typical use of this information in the browser is to enable "reconversion"
    * features of IME that puts back the already committed text into the
    * pre-commit composition state. Another use is to improve the precision
    * of suggestion of IME by taking the context into account (e.g., if the caret
-   * looks to be on the begining of a sentense, suggest capital letters in a
+   * looks to be on the beginning of a sentence, suggest capital letters in a
    * virtual keyboard).
    *
    * When the focus is not on text, call this function setting <code>text</code>