Fix some more speling mistakes.

doc/chapter-cmdline.txt

@@ -20,15 +20,15 @@ cycle through all results. If no match is found, no suggestion will be inserted
 into the commandline. For the "set" command, the completion also works for
 configuration variable names.
 
-In additon, some common key combination such as Ctrl-G (to cancel input),
+In addition, some common key combination such as Ctrl-G (to cancel input),
 Ctrl-K (to delete text from the cursor position to the end of line), Ctrl-U (to
 clear the whole line) and Ctrl-W (to delete the word before the current cursor
 position) were added.
 
 Please be aware that the input history of both the command line and the search
 functions are saved to the filesystems, to the files
 \~/.newsbeuter/history.cmdline resp. \~/.newsbeuter/history.search. By default,
-the last 100 entries are saved, but this can be configured (configuratin
+the last 100 entries are saved, but this can be configured (configuration
 variable history-limit) and also totally disabled (by setting said variable to
 0).
 

doc/example-config

@@ -143,7 +143,7 @@
 # ignore-mode download
 
 ## configuration option: keep-articles-days
-## description: If set the a number greater than 0, only articles that are were published within the last <n> days are kept, and older articles are deleted. If set to 0 (default value), this option is not active.
+## description: If set to a number greater than 0, only articles that are were published within the last <n> days are kept, and older articles are deleted. If set to 0 (default value), this option is not active.
 ## parameter syntax: <days>
 # keep-articles-days 0
 

doc/hackers-guide.txt

@@ -154,8 +154,8 @@ Use the full potential of modern C++
 The C++ standard library comes with an extensive set of algorithms and data
 structures. Developers are encouraged to use especially the data structures,
 because the available container classes are standardized, their behaviour and
-usage is well-documented, and makes it possible to keeep the the overall logic
-is a pretty high level. More complex things that can only be done in C (like
+usage is well-documented, and makes it possible to keep the overall logic
+at a pretty high level. More complex things that can only be done in C (like
 special system calls) /should/ be encapsulated by a wrapper class in order to
 avoid potential mis-use of low-level functions and data structures. Good
 examples for wrapping low-level stuff are *class rss_feed*, *class rss_item*

doc/newsbeuter.txt

@@ -27,7 +27,7 @@ Why "Newsbeuter"?
 "Newsbeuter" is a pun on the German word "Wildbeuter", which means
 "hunter-gatherer". During the stone age, people hunted and gathered their food,
 and these days, they hunt and gather news and information. Credits for this
-idea goes to Clifford Wolf, who submitted it to a little competiton that was
+idea goes to Clifford Wolf, who submitted it to a little competition that was
 started when I got aware that the original name would violate French and
 European registered trademarks.
 
@@ -702,8 +702,8 @@ In addition, newsbeuter provides other, more powerful sequences, such as
 right on the screen, and characters between the text on the left and the text
 on the right will be filled by "[char]". Another powerful format is the
 conditional sequence, "%?[char]?[format 1]&[format 2]?": if the text of the
-sequence identifier "[char]" is non-empty, then "[format 1]" will be evaluted
-and inserted, otherwise "[format 2]" will be evaluted and inserted. The "&" and
+sequence identifier "[char]" is non-empty, then "[format 1]" will be evaluated
+and inserted, otherwise "[format 2]" will be evaluated and inserted. The "&" and
 "[format 2]" are optional, i.e. if the identifier's text is empty, then an
 empty string will be inserted.
 
@@ -871,7 +871,7 @@ command.
 The syntax is similar to the "highlight" configuration command, with the difference
 that there's no need to specify a target (since it only applies in the article list),
 and instead of a regular expression, a filter expression is used. After the filter
-expression, the colors and attributs are specified in the same way.
+expression, the colors and attributes are specified in the same way.
 
 Example: