docs: Update sections documentation (with examples)

#[builder(start_fn = init)]

#[serde(deny_unknown_fields)]

pub struct Sections {

    /// Purpose of the research

    /// The reason for the research or research organization to exist

    /// ### Example

    /// > "Develop the first atomic bombs in the world to assist the Allied forces and bring an end to WWII"

    #[validate(length(

        min = 10,

        max = "MAX_LENGTH_SECTION_MISSION",

    #[builder(default = "Purpose of the research".to_string())]

    #[serde(alias = "introduction", deserialize_with = "string_trim")]

    pub mission: String,

    /// Reason for the research

    /// A problem or situation within a research field requiring scientific effort, resources, and/or innovation to overcome

    /// ### Example

    /// > "During WWII, there was a fear that Germany was researching and developing nuclear weapons, giving them a decisive advantage over Allied forces, including the United States, Great Britain, and Canada."

    #[validate(length(

        min = 10,

        max = "MAX_LENGTH_SECTION_CHALLENGE",

    #[builder(default = "Reason for the research".to_string())]

    #[serde(deserialize_with = "string_trim")]

    pub challenge: String,

    /// List of actions taken to perform the research

    /// The plan, resources and actions taken to perform the research in a given project or organization

    /// ### Examples

    /// - "Production across four different sites in the United States, each with a different focus, for security and safety purposes"

    /// - "Research into new fields including nuclear fission, isotope separation methods, uranium enrichment, plutonium development, and weapons design"

    /// - "Military coordination for project construction and security management as well as defense communications to national leaders"

    #[validate(

        length(min = 1, max = "MAX_COUNT_APPROACH", message = "Please limit the number of approaches to 6"),

        custom(function = "validate_attribute_approach")

    #[builder(default = vec!["List of actions taken to perform the research".to_string()])]

    #[serde(deserialize_with = "vec_string_trim")]

    pub approach: Vec<String>,

    /// List of tangible proof that validates the research approach

    /// Tangible effects the research approach has on areas outside academia, such as industry, society, the surrounding environment, or culture

    /// ### Examples

    /// - "Development of the world's first atomic weapons"

    /// - "Introduction of the nuclear age, including advancements in nuclear science, engineering and a new source of energy"

    /// - "The end of WWII, along with many ethical and moral considerations related to use of atomic weapons"

    #[validate(length(min = 1, max = "MAX_COUNT_IMPACT"), custom(function = "validate_attribute_impact"))]

    #[builder(default = vec!["List of tangible proof that validates the research approach".to_string()])]

    #[serde(alias = "outcomes", deserialize_with = "vec_string_trim")]

    pub impact: Vec<String>,

    /// Tangible results of research activity

    /// Notable recognition or awards given to the research team, organization, or research products

    /// ### Examples

    /// - "At least six Nobel Prizes awarded to Manhattan Project researchers in the years following the end of the project"

    /// - "Creation of the Atomic Energy Commission in 1946, later becoming the Department of Energy and Nuclear Regulatory Commission"

    #[validate(length(min = 1, max = 4, message = "Please limit the number of achievements to 4"))]

    pub achievement: Option<Vec<String>>,

    /// Expertise as applied to technology in a given mission space

    /// ### Examples

    /// - "Gaseous diffusion and electromagnetic separation to create fissionable materials"

    /// - "Mechanisms for achieving supercritical mass for nuclear detonation"

    /// - "Nuclear reactor development, which paved the way for nuclear power"

    /// - "Radiochemistry for nuclear detonation analysis and advanced medical research with radioisotopes"

    /// - "Large-scale multidisciplinary scientific collaboration"

    #[validate(length(min = 1, max = "MAX_COUNT_CAPABILITIES"), custom(function = "validate_attribute_capabilities"))]

    pub capabilities: Option<Vec<String>>,

    /// Overview of research focus and areas

    /// ### Example Focus

    /// > "Developing fissionable materials for nuclear reactions to develop the world's first atomic weapons"

    /// ### Example Areas

    /// > "Topics related to and encapsulated within the project or organization"

    #[validate(nested)]

    #[builder(default = Research::init().build())]

    pub research: Research,