typo

git-svn-id: https://svn.r-project.org/R/trunk@87529 00db46b3-68df-0310-9c12-caf00c1e9a41

doc/manual/R-exts.texi

@@ -9939,7 +9939,7 @@ Apple provide a version of the address sanitizer in recent versions of
 its C/C++ compiler.  This will probably give messages about
 @I{`malloc: nano zone abandoned'} which are innocuous and can be suppressed
 by setting environment variable @env{MallocNanoZone} to @code{0}.
-It can be heloful to install debug symbols (@command{INSTALL --dsym} for
+It can be helpful to install debug symbols (@command{INSTALL --dsym} for
 the package under test and particularly for reverse dependences.
 @c https://stackoverflow.com/questions/64126942/malloc-nano-zone-abandoned-due-to-inability-to-preallocate-reserved-vm-space