fix typos

USAGE.md

@@ -295,7 +295,7 @@ instance. Use `ncdirect_init()` to create a direct mode context:
 struct ncdirect; // minimal state for a terminal
 
 // Initialize a direct-mode Notcurses context on the connected terminal at 'fp'.
-// 'fp' must be a tty. You'll usually want stdout. Direct mode supportes a
+// 'fp' must be a tty. You'll usually want stdout. Direct mode supports a
 // limited subset of Notcurses routines which directly affect 'fp', and neither
 // supports nor requires notcurses_render(). This can be used to add color and
 // styling to text in the standard output paradigm. 'flags' is a bitmask over

doc/man/man3/notcurses_directmode.3.md

@@ -88,7 +88,7 @@ The following flags are defined:
 
 * **NCDIRECT_OPTION_INHIBIT_SETLOCALE**: Unless this flag is set,
     **ncdirect_init** will call **setlocale(LC_ALL, NULL)**. If the result is
-    either "**C**" or "**POSIX**", it will print a diagnostic to **stder**, and
+    either "**C**" or "**POSIX**", it will print a diagnostic to **stderr**, and
     then call **setlocale(LC_ALL, "").** This will attempt to set the locale
     based off the **LANG** environment variable. Your program should call
     **setlocale(3)** itself, usually as one of the first lines.

doc/man/man3/notcurses_init.3.md

@@ -106,7 +106,7 @@ zero. The following flags are defined:
 
 * **NCOPTION_INHIBIT_SETLOCALE**: Unless this flag is set, **notcurses_init**
     will call **setlocale(LC_ALL, NULL)**. If the result is either "**C**" or
-    "**POSIX**", it will print a diagnostic to **stder**, and then call
+    "**POSIX**", it will print a diagnostic to **stderr**, and then call
     **setlocale(LC_ALL, "").** This will attempt to set the locale based off
     the **LANG** environment variable. Your program should call **setlocale(3)**
     itself, usually as one of the first lines.