build: curl option BUILD_MISC_DOCS set OFF

Curl option BUILD_MISC_DOCS builds misc man pages and set ON by default.
Other documentation building options such as ENABLE_CURL_MANUAL and
BUILD_LIBCURL_DOCS was set OFF in BuildLibCurl.cmake.
I suppose this option has to be added in commit 7192bf66
("third_party: update libcurl from 8.7.0 to 8.8.0+patches") and set OFF.

Follows up #9885

NO_TEST=does not change tarantool behavior
NO_DOC=does not change tarantool behavior

(cherry picked from commit 1080995fa4083c4de6aa19e964b98f0ffb7e34c5)

changelogs/unreleased/libcurl-doc-option-fix.md

+## bugfix/build
+
+* The `BUILD_MISC_DOCS` curl option is now disabled by default (gh-10576).

cmake/BuildLibCURL.cmake

@@ -43,6 +43,7 @@ macro(curl_build)
 
     # Let's disable building documentation for curl to save build time.
     list(APPEND LIBCURL_CMAKE_FLAGS "-DENABLE_CURL_MANUAL=OFF")
+    list(APPEND LIBCURL_CMAKE_FLAGS "-DBUILD_MISC_DOCS=OFF")
     list(APPEND LIBCURL_CMAKE_FLAGS "-DBUILD_LIBCURL_DOCS=OFF")
 
     # Setup use of openssl, use the same OpenSSL library