doc [ci skip] #10383

- test/README.md: document luassert `TableFormatLevel`
- CONTRIBUTING.md: absorb parts of the old "Development tips" wiki page

runtime/autoload/python3complete.vim

@@ -44,7 +44,7 @@
 "
 
 if !has('python3')
-    echo "Error: Required vim compiled with +python3"
+    echo 'Error: Requires python3 + pynvim.  :help provider-python'
     finish
 endif
 

runtime/autoload/pythoncomplete.vim

@@ -42,7 +42,7 @@
 "
 
 if !has('python')
-    echo "Error: Required vim compiled with +python"
+    echo 'Error: Requires python + pynvim.  :help provider-python'
     finish
 endif
 

runtime/doc/eval.txt

@@ -5351,10 +5351,11 @@ jobwait({ids}[, {timeout}])				*jobwait()*
 		Wait for a set of jobs to complete.
 
 		{ids} is a list of |job-id|s to wait for.
-		{timeout} is the maximum number of milliseconds to wait.
+		{timeout} is the maximum waiting time in milliseconds, -1
+		means forever.
 
-		Use zero {timeout} to check the status of a job: >
-			let exited = jobwait([{job-id}], 0)[0] >= 0
+		Timeout of 0 can be used to check the status of a job: >
+			let running = jobwait([{job-id}], 0)[0] == -1
 <
 		During jobwait() callbacks for jobs not in the {ids} list may
 		be invoked. The screen will not redraw unless |:redraw| is
@@ -8572,13 +8573,10 @@ timer_start({time}, {callback} [, {options}])
 		waiting for input.
 
 		{options} is a dictionary.  Supported entries:
-		   "repeat"	Number of times to repeat calling the
-				callback.  -1 means forever.  When not present
-				the callback will be called once.
+		   "repeat"	Number of times to repeat the callback.
+				-1 means forever.  Default is 1.
 				If the timer causes an error three times in a
-				row the repeat is cancelled.  This avoids that
-				Vim becomes unusable because of all the error
-				messages.
+				row the repeat is cancelled.
 
 		Example: >
 			func MyHandler(timer)
@@ -8586,8 +8584,7 @@ timer_start({time}, {callback} [, {options}])
 			endfunc
 			let timer = timer_start(500, 'MyHandler',
 				\ {'repeat': 3})
-<		This will invoke MyHandler() three times at 500 msec
-		intervals.
+<		This invokes MyHandler() three times at 500 msec intervals.
 
 timer_stop({timer})					*timer_stop()*
 		Stop a timer.  The timer callback will no longer be invoked.

runtime/doc/nvim_terminal_emulator.txt

@@ -129,7 +129,7 @@ Example: >
   input to the terminal.
 
 Use |jobwait()| to check if the terminal job has finished: >
-    let exited = jobwait([&channel], 0)[0] >= 0
+    let running = jobwait([&channel], 0)[0] == -1
 
 ==============================================================================
 :Termdebug plugin				*terminal-debug*

runtime/doc/options.txt

@@ -3210,7 +3210,7 @@ A jump table for the options with a short description can be found at |Q_op|.
 	so far, matches.  The matched string is highlighted.  If the pattern
 	is invalid or not found, nothing is shown.  The screen will be updated
 	often, this is only useful on fast terminals.
-<	Note that the match will be shown, but the cursor will return to its
+	Note that the match will be shown, but the cursor will return to its
 	original position when no match is found and when pressing <Esc>.  You
 	still need to finish the search command with <Enter> to move the
 	cursor to the match.

runtime/doc/provider.txt

@@ -57,14 +57,14 @@ If you run into problems, uninstall _both_ then install "pynvim" again: >
 
 PYTHON PROVIDER CONFIGURATION ~
 						*g:python_host_prog*
-Path to Python 2 interpreter. Setting this makes startup faster. Also useful
-for working with virtualenvs.  >
-    let g:python_host_prog  = '/path/to/python'	  " Python 2
+Command to start Python 2 (executable, not directory). Setting this makes
+startup faster. Useful for working with virtualenvs.  >
+    let g:python_host_prog  = '/path/to/python'
 <
 						*g:python3_host_prog*
-Path to Python 3 interpreter. Setting this makes startup faster. Also useful
-for working with virtualenvs.  >
-    let g:python3_host_prog = '/path/to/python3'  " Python 3
+Command to start Python 3 (executable, not directory). Setting this makes
+startup faster. Useful for working with virtualenvs.  >
+    let g:python3_host_prog = '/path/to/python3'
 <
 						*g:loaded_python_provider*
 To disable Python 2 support: >