Write proper sentences and use articles for nouns when necessary.
Begin each sentence with a capital letter and end it with a full stop or other appropriate punctuation.
Try to write short, clear sentences without too much recourse to subordinate clauses. When you think that you have finished your page, read it again and revise any sentence that has an overly complicated structure.
Decide on how to address your readers. Since DokuWiki is geared towards writing documentation, you will often have to instruct your readers, how to do certain things. You can use the imperative form („Do this!“), the we/you form („Then we/you click on…“) or the I form („I then add the foo to bar, using…“). Do not mix these forms.
Check your page for grammatical or spelling errors before saving it. If your text shows many errors, it will decrease the credibility of your statements, regardless of how well-thought they may be.
Develop your own style. Don't force yourself to write in a manner you are not comfortable with. This would only sound unnatural and be unpleasant to read.